[bug#31239] Make alsa find its plugins

[Danny Milosavljevic]

Hi Julien,

good idea!

The indentation in the patch files is off (alsa-lib uses tabs in its source 
code).

Also, what is 0001-Add-support-for-a-ALSA_PLUGIN_DIR-environment-variab.patch
embedded in this patch for?  Maybe for upstream?  Nice :)

You already patch the individual files in alsa-lib.

Note: It would be possible to use

++      char* plugdir = getenv("ALSA_PLUGIN_DIR") ?: ALSA_PLUGIN_DIR;

instead of

++      char* plugdir = ALSA_PLUGIN_DIR;
++        char* envplugdir = getenv("ALSA_PLUGIN_DIR");
++        if(envplugdir != NULL)
++            plugdir = envplugdir;

(especially since it's repeated multiple times) but maybe that's too obscure.

So LGTM except for the indentation and extra patch file!

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