Use the common autotools module that was added in the last commit so that
we can clean up the various Makefile.am's in gdk/ and gtk/, and also
make more Visual Studio projects completed during 'make dist', by adding
minimal items to those other Makefile.am's. This also allows us to make
the property sheets that does the copying of headers and built items
completed at 'make dist', so that we won't have to worry too much about
headers being added (although it would be unlikely for GTK+-2.x).
339fd3d3f6
