[Python-checkins] [python/cpython] e4f961: improve alignment autoconf test (#1129)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/python/cpython
  Commit: e4f961be0946639eb4356e274268dd9b5e90da9b
      https://github.com/python/cpython/commit/e4f961be0946639eb4356e274268dd9b5e90da9b
  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.