* app/makefile.cygwin
	* app/makefile.msc
	* plug-ins/makefile.cygwin
	* plug-ins/makefile.msc
	* modules/makefile.cygwin
	* modules/makefile.msc
	* tools/gcg/makefile.cygwin: Various updates. GCC-compiled DLL
	name change.

	* app/context_manager.c: Include paint_options.h for prototype.

	* app/gimpimage.c (gimp_image_initialize_projection): Break out of
 	loop as soon as possible.

	* app/menus.c (menus_last_opened_cmd_callback): Check if referring
 	to entry not in list.

	* app/module_db.c (valid_module_name): (Win32) Require module DLL
 	names to include name of compiler built with.

	* app/paths_dialog.c (paths_draw_segment_points): No use to draw
 	lines if we have less that two points.

	* app/qmask.c: Include stdio.h and floating_sel.h.

	* libgimp/makefile.cygwin: New file.

	* libgimp/Makefile.am:  Distribute above file.

	* libgimp/gimp.def: Update.

	* libgimp/gimpenv.c (gimp_directory): Don't warn about missing
 	home directory on Win32, it is perfectly natural.

	* plug-ins/sel2path/global.h: Bypass unused declarations, some
	of which clash with functions in MSVCRT.

	* plug-ins/sel2path/math.c
	* modules/colorsel_water.c: Define M_PI if necessary.

	* plug-ins/sel2path/sel2path.c: Include config.h and
 	glib.h. Define rint() if needed.

	* plug-ins/sel2path/vector.c: Include glib.h (for hypot() renaming
 	on Win32; In the MS C runtime, as hypot() is non-ANSI, it's called
 	_hypot(), sigh).

	* plug-ins/sinus/sinus_logo.h: Use indexed format, it is easier on
 	some compilers than the huge string.