[Bug 1778960] Re: SRU: Update python 2.7 to the final 2.7.15 release

[Robie Basak]

> po-33374: Tweak the definition of PyGC_Head, so compilers do not believe
  it is always 16-byte aligned on x86. This prevents crashes with more
  aggressive optimizations present in GCC 8.

Will this cause any ABI issues? It isn't clear to me, so I'd like
confirmation of your opinion please Matthias before accepting. I do see
that the code seems to incorporate some accommodation for the old
structure, but I don't know enough about this area to be sure that this
fully mitigates any ABI issues.

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Title:
  SRU: Update python 2.7 to the final 2.7.15 release

Status in python2.7 package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04 LTS shipped with the python 2.7.15 release candidate.
  Please let's update to the final release.

  Upstream changes are:

  - bpo-33374: Tweak the definition of PyGC_Head, so compilers do not believe
    it is always 16-byte aligned on x86. This prevents crashes with more
    aggressive optimizations present in GCC 8.

  - Identify as 2.7.15 instead of 2.7.15rc1

  Acceptance criteria: The package builds, and the testsuite doesn't
  show regressions.

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