utils/alsa.m4: update for newer autoconf.

17 Dec 2020


      alsa-project/alsa-lib pull request #106 was opened from sezero:
fixes autoconf-2.70 warnings. should be compatible down to autoconf-2.59.
Request URL   : https://github.com/alsa-project/alsa-lib/pull/106
Patch URL     : https://github.com/alsa-project/alsa-lib/pull/106.patch
Repository URL: https://github.com/alsa-project/alsa-lib

GitHub pull_request - opened

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