[3.9] bpo-41302: Fix build with system libmpdec (GH-21481) #21486
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Move definition of UNUSED from modified headers of libmpdec to
_decimal.c itself. This makes the vendored source closer to the
standalone library and fixes build with --with-system-libmpdec.
Tested to build fine with either system libmpdec or the vendored one.
(cherry picked from commit 015efdb)
Co-authored-by: Felix Yan [email protected]
https://bugs.python.org/issue41302