Do not use gold linker

Unfortunately our Linux CI server ships with a rather old gold linker
which does not work together with latest clang.

chromiumcontent/args/ffmpeg.gn

@@ -6,3 +6,4 @@ enable_widevine = true
 proprietary_codecs = false
 is_component_ffmpeg = true
 ffmpeg_branding = "Chromium"
+use_gold = false

chromiumcontent/args/shared_library.gn

@@ -7,3 +7,4 @@ enable_widevine = true
 proprietary_codecs = true
 is_component_ffmpeg = true
 ffmpeg_branding = "Chrome"
+use_gold = false

chromiumcontent/args/static_library.gn

@@ -7,3 +7,4 @@ enable_widevine = true
 proprietary_codecs = true
 is_component_ffmpeg = true
 ffmpeg_branding = "Chrome"
+use_gold = false