2009-11-20  Vladimir Serbinenko  <phcoder@gmail.com>

	SDL support.

	* Makefile.in (LIBSDL): New variable.
	(enable_grub_emu_sdl): Likewise.
	* conf/i386-pc.rmk (grub_emu_SOURCES): Add video files.
	(grub_emu_SOURCES) [enable_grub_emu_sdl]: Add util/sdl.c.
	(grub_emu_LDFLAGS) [enable_grub_emu_sdl]: Add $(LIBSDL).
	* configure.ac: Detect SDL availability and add --enable-grub-emu-sdl
	* util/sdl.c: New file.