[gn] Mac entitlement config for font subset (flutter#34989)

tools/font-subset/BUILD.gn

@@ -22,6 +22,10 @@ executable("_font-subset") {
       "CoreText.framework",
     ]
   }
+
+  metadata = {
+    font_subset_without_entitlement = [ "font-subset" ]
+  }
 }
 
 generated_file("_font-subset-license") {
@@ -40,6 +44,14 @@ generated_file("_font-subset-license") {
   ]
 }
 
+generated_file("font_entitlement_config") {
+  outputs = [ "$target_gen_dir/font_subset_without_entitlements.txt" ]
+
+  data_keys = [ "font_subset_without_entitlement" ]
+
+  deps = [ ":_font-subset" ]
+}
+
 zip_bundle("font-subset") {
   if (is_mac) {
     # Mac artifacts sometimes use mac and sometimes darwin. Standardizing the
@@ -74,4 +86,13 @@ zip_bundle("font-subset") {
     ":_font-subset-license",
     "//flutter/tools/const_finder",
   ]
+  if (is_mac) {
+    deps += [ ":font_entitlement_config" ]
+    files += [
+      {
+        source = "$target_gen_dir/font_subset_without_entitlements.txt"
+        destination = "without_entitlements.txt"
+      },
+    ]
+  }
 }