[issue11734] Add half-float (16-bit) support to struct module

[Mark Dickinson]

Mark Dickinson added the comment:

Refreshed and updated patch, cleaning up some style issues, fixing a failure to return -1 on exception in np_halffloat, and removing some endianness-determining casty expressions in favour of using PY_LITTLE_ENDIAN.

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Added file: http://bugs.python.org/file38043/cpython-struct-float16-v7.patch

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