they're not needed outside of the source tree (BUG#12057)
- Removed some more unneeded files from "make install" along the way


scripts/Makefile.am:
  - don't install the following files with "make install", as they are
    not needed to be installed: 
    make_win_src_distribution, make_win_binary_distribution,
    make_binary_distribution, make_sharedlib_distribution
support-files/MacOSX/Makefile.am:
  - don't install the Mac OS X support files when running "make install" -
    they're not needed outside of the source tree (BUG#12057)
support-files/Makefile.am:
  - don't install the RPM spec files with "make install" - they are not
    needed outside of the source tree