pass header list to gen2.py by a text file (avoid command line length limit on windows)

modules/python/src2/gen2.py

@@ -831,7 +831,6 @@ class PythonWrapperGenerator(object):
 
         # step 1: scan the headers and build more descriptive maps of classes, consts, functions
         for hdr in srcfiles:
-            print(hdr)
             decls = parser.parse(hdr)
             if len(decls) == 0:
                 continue
@@ -904,6 +903,6 @@ if __name__ == "__main__":
     if len(sys.argv) > 1:
         dstdir = sys.argv[1]
     if len(sys.argv) > 2:
-        srcfiles = sys.argv[2:]
+        srcfiles = open(sys.argv[2], 'r').read().split(';')
     generator = PythonWrapperGenerator()
     generator.gen(srcfiles, dstdir)