Build: forbid builds in working directories containing white spaces
    
    Spaces are causing problems in libtool, makefiles, autoconf itself, gettextize
    framework etc. so this issue cannot be easily fixed.
    
    Return on investment is too small to invest into this. Let's detect the
    whitespace early and error out with descriptive error message.
    
    https://fedorahosted.org/freeipa/ticket/6537
    
    Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>