Projucer (Xcode): Include quotes when echoing post build commands

extras/Projucer/Source/ProjectSaving/jucer_ProjectExport_Xcode.h

@@ -63,7 +63,7 @@ public:
 
     ScriptBuilder& echo (const String& text)
     {
-        return insertLine ("echo " + doubleQuoted (text.removeCharacters ("\"")));
+        return insertLine ("echo " + text.replace ("\"", "\\\""));
     }
 
     ScriptBuilder& remove (const String& path)