gl-renderer: does not need matrix.c

The symbols of matrix.c are already exported by libweston, no need to build
them again.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/meson.build

@@ -443,7 +443,6 @@ if get_option('renderer-gl')
 
 	srcs_renderer_gl = [
 		'gl-renderer.c',
-		'../shared/matrix.c',
 		linux_dmabuf_unstable_v1_protocol_c,
 		linux_dmabuf_unstable_v1_server_protocol_h,
 	]