Fix fork-bomb when py2exe is used

reinvokePerSourceFile executes clcache.exe clcache [flags] source

clcache argument here is in turn detected as a source, and it reinvokes
itself endlessly

clcache.py

@@ -792,7 +792,9 @@ def reinvokePerSourceFile(cmdLine, sourceFiles):
     commands = []
     for sourceFile in sourceFiles:
         # The child command consists of clcache.py ...
-        newCmdLine = [sys.executable, sys.argv[0]]
+        newCmdLine = [sys.executable]
+        if not hasattr(sys, "frozen"):
+            newCmdLine.append(sys.argv[0])
 
         for arg in cmdLine:
             # and the current source file ...