Revert "contrib: ffmpeg: disable non-h264 hwaccels (fixes #8537)"

This reverts commit c16bc980.
This is no longer applicable with current libav HEAD.

contrib/src/ffmpeg/rules.mak

@@ -99,6 +99,7 @@ endif
 # Linux
 ifdef HAVE_LINUX
 FFMPEGCONF += --target-os=linux --enable-pic
+
 endif
 
 # Windows
@@ -120,12 +121,6 @@ else # !Windows
 FFMPEGCONF += --enable-pthreads
 endif
 
-# Disable mpegvideo-based hwaccel - known broken
-FFMPEGCONF += \
-	$(foreach codec,h263 mpeg1 mpeg2 mpeg4 vc1 wmv3,\
-		$(foreach api,dxva2 vaapi vdpau,\
-			--disable-hwaccel=$(codec)_$(api)))
-
 # Build
 PKGS += ffmpeg
 ifeq ($(call need_pkg,"libavcodec >= 54.25.0 libavformat >= 53.21.0 libswscale"),)