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

build/linux/BUILD.gn

Index: build/linux/BUILD.gn
diff --git a/build/linux/BUILD.gn b/build/linux/BUILD.gn
index 97428b4eda155cdb87cc70d91ab057c3f23eefb5..a44c117e85f37ec42285ba3b64d321c873d67975 100644
--- a/build/linux/BUILD.gn
+++ b/build/linux/BUILD.gn
@@ -115,6 +115,13 @@ group("fontconfig") {
   }
 }
 
+if (!is_chromecast) {
+  pkg_config("freetype2_config") {
+    visibility = [ ":freetype2" ]
+    packages = [ "freetype2" ]
+  }
+}
+
 group("freetype2") {
   if (is_chromecast) {
     # Chromecast platform doesn't provide freetype, so use Chromium's.
@@ -123,6 +130,6 @@ group("freetype2") {
       "//third_party/freetype-android:freetype",
     ]
   } else {
-    public_configs = [ "//build/config/linux:freetype2" ]
+    public_configs = [ ":freetype2_config" ]
   }
 }