disable sdl apps/libs for m68k, because of broken alsa

package/SDL_gfx/Makefile

@@ -14,6 +14,8 @@ PKG_BUILDDEP:=		sdl
 PKG_URL:=		http://www.ferzkopp.net/joomla/content/view/19/14/
 PKG_SITES:=		http://www.ferzkopp.net/Software/SDL_gfx-2.0/
 
+PKG_ARCH_DEPENDS:=	!m68k
+
 PKG_SUBPKGS:=		LIBSDL_GFX LIBSDL_GFX_DEV
 PKGSD_LIBSDL_GFX_DEV:=	development files for SDL_gfx
 PKGSC_LIBSDL_GFX_DEV:=	devel

package/SDL_ttf/Makefile

@@ -14,6 +14,8 @@ PKG_BUILDDEP:=		sdl freetype gettext-tiny
 PKG_URL:=		http://www.libsdl.org/projects/SDL_ttf/
 PKG_SITES:=		http://www.libsdl.org/projects/SDL_ttf/release/
 
+PKG_ARCH_DEPENDS:=      !m68k
+
 PKG_SUBPKGS:=		LIBSDL_TTF LIBSDL_TTF_DEV
 PKGSD_LIBSDL_TTF_DEV:=	development files
 PKGSC_LIBSDL_TTF_DEV:=	devel

package/motion/Makefile

@@ -15,6 +15,8 @@ PKG_BUILDDEP:=		jpeg sdl
 PKG_URL:=		http://www.lavrsen.dk/twiki/bin/view/Motion/WebHome
 PKG_SITES:=		${MASTER_SITE_SOURCEFORGE:=motion/}
 
+PKG_ARCH_DEPENDS:=      !m68k
+
 include ${TOPDIR}/mk/package.mk
 
 $(eval $(call PKG_template,MOTION,${PKG_NAME},${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))

package/sdl-image/Makefile

@@ -15,6 +15,8 @@ PKG_URL:=		http://www.libsdl.org/
 PKG_SITES:=		http://www.libsdl.org/projects/SDL_image/release/
 PKG_NEED_CXX:=		1
 
+PKG_ARCH_DEPENDS:=      !m68k
+
 PKG_SUBPKGS:=		LIBSDL_IMAGE LIBSDL_IMAGE_DEV
 PKGSD_LIBSDL_IMAGE_DEV:=development files for sdlimage
 PKGSC_LIBSDL_IMAGE_DEV:=devel