do not warn on missing builtin libs like GL; #2808

emcc

@@ -816,7 +816,8 @@ try:
             break
         if found: break
       if found: break
-    if not found: logging.warning('emcc: cannot find library "%s"', lib)
+    if not found and lib not in ['GL', 'GLU', 'glut']: # whitelist our default libraries
+      logging.warning('emcc: cannot find library "%s"', lib)
 
   # If not compiling to JS, then we are compiling to an intermediate bitcode objects or library, so
   # ignore dynamic linking, since multiple dynamic linkings can interfere with each other