MFH: r519233 r519241 r519244

Fix namespace pollution in python3.5 and python3.6 (upstreamed fix)

The standard math library (libm) may follow IEEE-754 recommendation to
include an implementation of sinPi(), i.e. sinPi(x):=sin(pi*x).
And this triggers a name clash, found by FreeBSD developer
Steve Kargl, who worked on putting sinpi into libm used on FreeBSD
(it has to be named "sinpi", not "sinPi", cf. e.g.
https://en.cppreference.com/w/c/experimental/fpext4).

• python2.7 and > 3.6 are already fixed

PR: 232792
Submitted by: Steve Kargl <sgk@troutmask.apl.washington.edu>, Dima Pasechnik <dimpase+freebsd@gmail.com>
Approved by: python (maintainer timeout)
Obtained from: https://github.com/python/cpython/commit/b545ba0a508a5980ab147ed2641a42be3b31a2db

Backport fix of https://bugs.python.org/issue32849

This is needed for starting sysutils/azure-agent at boot:
https://github.com/Azure/WALinuxAgent/issues/1687

Obtained from: https://github.com/python/cpython/pull/12852/commits/f9c01a16dae8aa15d264a1937fb589e8598d1c88
Sponsored by: The FreeBSD Foundation

Fix makefile ordering.

Reported by: mat

Approved by: ports-secteam (miwi)
Sponsored by: The FreeBSD Foundation