Remove unused X11 dependency

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

configure.ac

@@ -35,7 +35,6 @@ AC_SUBST(LIBDRM_VERSION)
 
 dnl Check for VA-API
 PKG_CHECK_MODULES(LIBVA_DEPS,     [libva >= va_api_version])
-PKG_CHECK_MODULES(X11_DEPS, [x11])
 
 dnl Check for VA/DRM API
 PKG_CHECK_MODULES(LIBVA_DRM_DEPS, [libva-drm],

src/Makefile.am

@@ -1,8 +1,8 @@
-AM_CPPFLAGS = -DPTHREADS $(X11_DEPS_CFLAGS) $(DRM_CFLAGS) $(LIBVA_DEPS_CFLAGS)
+AM_CPPFLAGS = -DPTHREADS $(DRM_CFLAGS) $(LIBVA_DEPS_CFLAGS)
 
 backend_cflags = -Wall -fvisibility=hidden
 backend_ldflags = -module -avoid-version -no-undefined -Wl,--no-undefined
-backend_libs = -lpthread -ldl $(DRM_LIBS) $(X11_DEPS_LIBS) $(LIBVA_DEPS_LIBS)
+backend_libs = -lpthread -ldl $(DRM_LIBS) $(LIBVA_DEPS_LIBS)
 
 backend_c = dump.c object_heap.c config.c surface.c context.c buffer.c \
 	header.c picture.c subpicture.c image.c