[wip] libre: fop: update to 2.7
    
    This currently fails with the following error:
    ==> Starting build()...
    Buildfile: /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop/build.xml
       [tstamp] Honouring environment variable SOURCE_DATE_EPOCH which has been set to 1651520391
    Trying to override old definition of task javac
    Trying to override old definition of task junit
    
    init-avail:
         [echo] ------------------- Apache FOP 2.7 [1999-2022] ----------------
         [echo] See build.properties and build-local.properties for additional build settings
         [echo] Apache Ant(TM) version 1.10.9 compiled on December 22 1969
         [echo] VM: 25.332-b09, Oracle Corporation
         [echo] JAVA_HOME: ${env.JAVA_HOME}
         [echo] JAI Support NOT Present
         [echo] JCE Support PRESENT
         [echo] JUnit Support PRESENT
         [echo] XMLUnit Support NOT Present - you can get it from http://xmlunit.sourceforge.net
    
    init:
    
    codegen:
         [echo] Generating the java files from xml resources
         [xslt] Transforming into /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop/build/gensrc/org/apache/fop/fonts/base14
    
    compile-java:
        [javac] Compiling 1580 source files to /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop/build/classes
        [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/svg/SVGUtilities.java:32: error: package org.apache.batik.constants does not exist
        [javac] import org.apache.batik.constants.XMLConstants;
        [javac]                                  ^
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/fonts/LazyFont.java:106: warning: [deprecation] XMLFontMetricsReader in org.apache.fop.fonts has been deprecated
        [javac]                     XMLFontMetricsReader reader = null;
        [javac]                     ^
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/fonts/LazyFont.java:110: warning: [deprecation] XMLFontMetricsReader in org.apache.fop.fonts has been deprecated
        [javac]                     reader = new XMLFontMetricsReader(src, resourceResolver);
        [javac]                                  ^
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/fonts/autodetect/FontFileFinder.java:74: warning: [deprecation] andFileFilter(IOFileFilter,IOFileFilter) in FileFilterUtils has been deprecated
        [javac]         return FileFilterUtils.andFileFilter(
        [javac]                               ^
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/fonts/autodetect/FontFileFinder.java:85: warning: [deprecation] andFileFilter(IOFileFilter,IOFileFilter) in FileFilterUtils has been deprecated
        [javac]         return FileFilterUtils.andFileFilter(
        [javac]                               ^
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/render/afp/AFPImageHandlerRawStream.java:47: error: cannot find symbol
        [javac]         ImageFlavor.RAW_PDF
        [javac]                    ^
        [javac]   symbol:   variable RAW_PDF
        [javac]   location: class ImageFlavor
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/render/ps/PSDocumentHandler.java:166: error: cannot find symbol
        [javac]             this.gen.setAcrobatDownsample(psUtil.isAcrobatDownsample());
        [javac]                     ^
        [javac]   symbol:   method setAcrobatDownsample(boolean)
        [javac]   location: variable gen of type PSGenerator
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/render/ps/PSFontUtils.java:917: error: cannot find symbol
        [javac]             painter.addFallbackFont(name, typeface);
        [javac]                    ^
        [javac]   symbol:   method addFallbackFont(String,Typeface)
        [javac]   location: variable painter of type GeneralGraphics2DImagePainter
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/render/ps/ResourceHandler.java:153: error: cannot find symbol
        [javac]         gen.setAcrobatDownsample(psUtil.isAcrobatDownsample());
        [javac]            ^
        [javac]   symbol:   method setAcrobatDownsample(boolean)
        [javac]   location: variable gen of type PSGenerator
        [javac] /home/gnutoo/work/projects/parabola/abslibre/libre/fop/src/fop-2.7/fop-core/src/main/java/org/apache/fop/svg/SVGUtilities.java:226: error: cannot find symbol
        [javac]         border.setAttributeNS(XMLConstants.XLINK_NAMESPACE_URI, "href",
        [javac]                               ^
        [javac]   symbol:   variable XMLConstants
        [javac]   location: class SVGUtilities
        [javac] Note: Some input files use unchecked or unsafe operations.
        [javac] Note: Recompile with -Xlint:unchecked for details.
        [javac] 6 errors
        [javac] 5 warnings
    
    Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>