[PATCH] os.remove shouldn't fail, if file doesn't exist

[Ismail Pazarbasi]

Hi emaste,

os.remove might throw an exception (of type OSError), if given file
doesn't exist. Catch the exception, and ignore it //iff// errno is
ENOENT. Rethrow the exception, if errno is not ENOENT.

http://reviews.llvm.org/D6362

Files:
  scripts/Python/buildSwigPython.py
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