macOS: Update custom options for aarch64 architecture to use -WM10.15

Reason: The newer xCode linker is no longer compatible with the current FPC compiler. Await a future FPC fix. This is a temporary workaround.

Author: GerryFerdinandus

source/project/tracker_editor/trackereditor.lpi

@@ -76,7 +76,7 @@
 begin
   If TargetCPU = 'aarch64' then
   begin
-    CustomOptions += '-WM11.0';
+    CustomOptions += '-WM10.15';
   end
   else
   begin