[issue9425] Rewrite import machinery to work with unicode paths

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

_PyFile_FromFdUnicode.patch: create _PyFile_FromFdUnicode() function. It will be used in import.c to open a file using an unicode filename.

For _PyFile_FromFd(), I kept the previous behaviour: clear the exception on PyUnicode_DecodeFSDefault() error.

For fileobject.h: I used the same style than unicodeobject.h, one argument per line with their name. I prefer to write the argument name because the header can be used as a quick documentation.

As _PyFile_FromFd(), name is optional (can be NULL) for _PyFile_FromFdUnicode().

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Added file: http://bugs.python.org/file18469/_PyFile_FromFdUnicode.patch

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