Bug 1559213 Allow to use system av1 libs instead of bundled r=glandium,media-playback-reviewers,aosmond,stransky,alwu

Differential Revision: https://phabricator.services.mozilla.com/D34921

image/decoders/moz.build

@@ -36,6 +36,9 @@ if CONFIG["MOZ_AV1"]:
         "nsAVIFDecoder.cpp",
     ]
 
+    if CONFIG["MOZ_SYSTEM_AV1"]:
+        CXXFLAGS += CONFIG["MOZ_SYSTEM_LIBAOM_CFLAGS"]
+
 if CONFIG["MOZ_JXL"]:
     UNIFIED_SOURCES += [
         "nsJXLDecoder.cpp",

image/moz.build

@@ -139,5 +139,8 @@ LOCAL_INCLUDES += [
 
 LOCAL_INCLUDES += CONFIG["SKIA_INCLUDES"]
 
+if CONFIG["MOZ_SYSTEM_AV1"]:
+    CXXFLAGS += CONFIG["MOZ_SYSTEM_LIBAOM_CFLAGS"]
+
 # Add libFuzzer configuration directives
 include("/tools/fuzzing/libfuzzer-config.mozbuild")