[Python-checkins] [python/cpython] 0e2367: improve alignment autoconf test (#1129)

[GitHub]

  Branch: refs/heads/benjamin-backport-autoconf-test
  Home:   https://github.com/python/cpython
  Commit: 0e2367d326c942ea86f28042d99c52cd17ea3f22
      https://github.com/python/cpython/commit/0e2367d326c942ea86f28042d99c52cd17ea3f22
  Author: Benjamin Peterson <benjamin at python.org>
  Date:   2017-04-14 (Fri, 14 Apr 2017)

  Changed paths:
    M aclocal.m4
    M configure
    M configure.ac

  Log Message:
  -----------
  improve alignment autoconf test (#1129)

Replace the deprecated AC_TRY_RUN with AC_RUN_IFELSE. Also, standardize the
variable name and allow for caching of the result.