Make alsa_plugin build again.

[tp2750]

Trying to fix #8714.

• Identified the version of FFMPEG that provided the required library: libasound_module_pcm_a52.so
• Identified the architectures, where it works. Looks like it is those that were supported by julia 1.0
• Updated alsa_plugins to version 1.2.7.1
• Architecture armv6l does not build

[tp2750]

Updated alsa_plugin to 1.2.7.1. Now it builds with current version of FFMPEG.
Only the armv6l architecture does not build.

[tp2750]

I don't understand why it fails to build for x86-64. It builds fine locally.

[sergstesh]

I don't understand why it fails to build for x86-64. It builds fine locally.

I do not understand the quoted statement. Specifically, regarding "It builds fine locally" - it builds fine on what architecture ?

Regarding "it fails to build for x86-64" - what is the exact failure ? I.e. what are the error/warning messages, etc ? Are the warning/error messages to be looked at presented in https://buildkite.com/julialang/yggdrasil/builds/11024#018ff814-c642-48ef-a8bb-c17089bbf83b ?

[ViralBShah]

Close in favor of #9105