* app/makefile.{cygwin,msc}: Add gdiplay_color. Create gimp.def
from gimp.sym.
* app/gimp.def: Removed.
* libgimp/gimpenv.c (gimp_data_directory) (Win32): Also check for
the executable being in the plug-ins subdirectory.
* plug-ins/makefile.{cygwin,msc}: Install also GIMPressionist
brushes, papers and presets.