Make the ms-windows theme engine build with mingw.

Make the ms-windows theme engine build with mingw.

2004-08-30  Tor Lillqvist  <tml@iki.fi>

	Make the ms-windows theme engine build with mingw.

	* configure.in: Expand also modules/engines/ms-windows/Theme/
	Makefile and .../Theme/gtk-2.0/Makefile.

	* modules/engines/ms-windows/Makefile.am: Adapt for building
	inside the GTK sources.

	* modules/engines/ms-windows/*.c: Use "foo.h" style includes for
	GTK and GDK headers. Use correct path for gdkwin32.h header.

	* modules/engines/ms-windows/msw_style.c: Don't use deprecated GDK
	API.

	* modules/engines/ms-windows/xp_theme_defs.h
	* modules/engines/ms-windows/xp_theme.c: Move definitions of TMT_*
	to xp_theme.c, as they are neither in mingw's nor Platform
	SDK's tmschema.h.

	* modules/engines/ms-windows/xp_theme.c: Define _WIN32_WINNT as
	0x0501 to get the necesssary stuff from mingw's uxtheme.h.