This change ports pyenv and Python patches to 3.7.12 to enable the
`ctypes `and `decimal` modules to compile.
While Python 3.7.12 itself compiles on arm64/M1, both of these modules
fail to compile, due to missing support for locating system libffi and
due to architecture gate-keeping. These issues have been fixed in newer
releases of Python, and in other pyenv patch bundles.
The following patches are provided:
1. `0001-Port-ctypes-and-system-libffi-patches-for-arm64-macO.patch` -
Fixes system `ffi.h`/`libffi` path determination and usage and
enables calling of variadic functions, fixing ctypes support
(consolidated port of existing pyenv patches for 2.7.18 that iterate
on this logic).
2. `0002-bpo-41100-fix-_decimal-for-arm64-Mac-OS-GH-21228.patch` -
Adds arm64 to the list of allowable architectures for the
`decimal` module (port of Python patch introduced in 3.8.10).
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