Makefile.am: use -XForeignFunctionInterface instead of -fffi for GHC 6.10 and newer
Makefile.am: use -XForeignFunctionInterface instead of -fffi for GHC 6.10 and newer

gtk2hs/gstreamer,gtk2hs/webkit,gtk2hs/vte,gtk2hs/webkit,gtk2hs/webkit,gtk2hs/vte