fix repeating global_funcs for fastcomp

Author: kripken

emscripten.py

@@ -994,7 +994,7 @@ def fix_item(item):
       pass
     # If no named globals, only need externals
     global_vars = []
-    global_funcs = ['_' + key for key, value in forwarded_json['Functions']['libraryFunctions'].iteritems() if value != 2] + metadata['externs']
+    global_funcs = list(set(['_' + key for key, value in forwarded_json['Functions']['libraryFunctions'].iteritems() if value != 2] + metadata['externs']))
     def math_fix(g):
       return g if not g.startswith('Math_') else g.split('_')[1]
     asm_global_funcs = ''.join(['  var ' + g.replace('.', '_') + '=global.' + g + ';\n' for g in maths]) + \