[crosstool-ng/crosstool-ng] 7efb49: Add compatibility with automake < 1.14

[Alexey Neyman]

  Branch: refs/heads/master
  Home:   https://github.com/crosstool-ng/crosstool-ng
  Commit: 7efb493d37f4a19bbd1bb01ca6d7cd17f7e586a0
      https://github.com/crosstool-ng/crosstool-ng/commit/7efb493d37f4a19bbd1bb01ca6d7cd17f7e586a0
  Author: Anton Maklakov <antmak.pub@gmail.com>
  Date:   2018-04-27 (Fri, 27 Apr 2018)

  Changed paths:
    M configure.ac

  Log Message:
  -----------
  Add compatibility with automake < 1.14

As we support CentOS, for example, we have a problem there

    automake: warnings are treated as errors
    kconfig/Makefile.am:26: warning: compiling 'lxdialog/checklist.c' in subdir requires 'AM_PROG_CC_C_O' in
    'configure.ac'
    autoreconf: automake failed with exit status: 1


  Commit: fa041df6fed76e966ef996ca75f27286c799b451
      https://github.com/crosstool-ng/crosstool-ng/commit/fa041df6fed76e966ef996ca75f27286c799b451
  Author: Alexey Neyman <stilor@att.net>
  Date:   2018-04-29 (Sun, 29 Apr 2018)

  Changed paths:
    M configure.ac

  Log Message:
  -----------
  Merge pull request #949 from antmak/build_centos7

Add compatibility with automake < 1.14


Compare: https://github.com/crosstool-ng/crosstool-ng/compare/d40964df8cb1...fa041df6fed7