Supress -Wunused-parameter when PICO_STDIO_ENABLE_CRLF_SUPPORT is unset (earlephilhower#998)

Author: DusterTheFirst

src/rp2_common/pico_stdio/stdio.c

@@ -315,6 +315,10 @@ void stdio_set_translate_crlf(stdio_driver_t *driver, bool enabled) {
     }
     driver->crlf_enabled = enabled;
 #else
+    // Suppress -Wunused-parameter
+    (void)driver;
+    (void)enabled;
+    
     panic_unsupported();
 #endif
-}
+}