fb856fc
add missing AC_PROG_[...] to configure.ac fixes: configure.ac: warning: missing AC_PROG_CPP wanted by: Makefile.in:5 configure.ac: warning: missing AC_PROG_INSTALL wanted by: Makefile.in:138 configure.ac: warning: missing AC_PROG_MAKE_SET wanted by: Makefile.in:144 Signed-off-by: Thomas Kuehne <thomas@kuehne.cn>