modified cmake file to not look for Libintl on mingw
modified cmake file to not look for Libintl on mingw

pmjdebruijn/openomf,gdeda/openomf,gdeda/openomf,omf2097/openomf,omf2097/openomf,pmjdebruijn/openomf,gdeda/openomf,omf2097/openomf,pmjdebruijn/openomf