Avoid using scandir/alphasort
Avoid using scandir/alphasort

They require POSIX 2008, which is a bit too "new" for my current liking. We can
do well enough with opendir/readdir/closedir and qsort.

aaronmjacobs/openal-soft,alexxvk/openal-soft,aaronmjacobs/openal-soft,alexxvk/openal-soft