🐳 Move linux pkg_config() calls into separate BUILD.gn files

content/common/BUILD.gn

Index: content/common/BUILD.gn
diff --git a/content/common/BUILD.gn b/content/common/BUILD.gn
index 30101b4a6a7ebd724aba41d112c4d170e02362a1..2019609503625753b599c236d392a09e8fe8f44c 100644
--- a/content/common/BUILD.gn
+++ b/content/common/BUILD.gn
@@ -287,7 +287,7 @@ source_set("common") {
   }
 
   if (use_pango) {
-    configs += [ "//build/config/linux:pangocairo" ]
+    configs += [ "//build/config/linux/pangocairo" ]
     if (use_ozone) {
       # If we're using pango, never use this ozone file (it was removed in all
       # non-ozone cases above).