* handle _PyMem_RawStrdup() failure
* Py_FrozenMain() releases memory on error
* Py_FrozenMain() duplicates the old locale, as done in main()

Modules/python.c:40: warning: ISO C90 forbids mixed declarations and code

Patch by Andrew Rowe.

Replace strdup() with _PyMem_RawStrdup() or _PyMem_Strdup(), depending if the
GIL is held or not.

* Replace malloc() with PyMem_RawMalloc()
* Replace PyMem_Malloc() with PyMem_RawMalloc() where the GIL is not held.
* _Py_char2wchar() now returns a buffer allocated by PyMem_RawMalloc(), instead
  of PyMem_Malloc()

encoded/decoded to/from UTF-8/surrogateescape, instead of the locale encoding
(which may be ASCII if no locale environment variable is set), to avoid
inconsistencies with os.fsencode() and os.fsdecode() functions which are
already using UTF-8/surrogateescape.

encoded/decoded to/from UTF-8/surrogateescape, instead of the locale encoding
(which may be ASCII if no locale environment variable is set), to avoid
inconsistencies with os.fsencode() and os.fsdecode() functions which are
already using UTF-8/surrogateescape.

UTF-8/surrogateescape, instead of the locale encoding (which may be ASCII if no
locale environment variable is set), to avoid inconsistencies with
os.fsencode() and os.fsdecode() functions which are already using
UTF-8/surrogateescape.

free the copy of the command-line.

Found using Clang's static analyzer.