[issue1528] Add os.fchmod

[Christian Heimes]

Christian Heimes added the comment:

I've applied the combined patch in r59242. I've tested Georg's
fchmod/fchown on my Linux system. They functions are working as expected.

However lchmod is not available on my system although it is in the
header files. It should be available on Mac and some other flavors of Unix.

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