add arch depends for mesa-demos

package/mesa-demos/Makefile

@@ -13,6 +13,8 @@ PKG_DEPENDS:=		mesalib
 PKG_BUILDDEP:=		MesaLib libglew
 PKG_SITES:=		ftp://ftp.freedesktop.org/pub/mesa/demos/${PKG_VERSION}/
 
+PKG_ARCH_DEPENDS:=      x86 x86_64 mips mipsel mips64 mips64el arm
+
 PKG_SUBPKGS:=		GLXINFO
 PKGSD_GLXINFO:=		glxinfo
 PKGSS_GLXINFO:=		libxt libxau libxdmcp libxcb libx11 libxext libglew