[client] egl: make filters damage aware

This saves a lot of GPU power for partial updates. Running testufo with
lanczos downscaling and FSR upscaling consumed over 90 W, but with this
commit, consumed only 75 W.

client/renderers/EGL/CMakeLists.txt

@@ -92,6 +92,7 @@ add_library(renderer_EGL STATIC
 	framebuffer.c
 	postprocess.c
 	ffx.c
+	filter.c
 	filter_ffx_cas.c
 	filter_ffx_fsr1.c
 	filter_downscale.c