alsa-tools: rewrite packaging

alsa-tools is actually a collection of 20 separate tools, each with their own
configure scripts.  The dependencies are varied, old, and estoric (FLTK, GTK+ 1, 2,
and 3, PyGTK 2, Qt3).

Instead of maintaining patches to try and pick a subset that builds, use
PACKAGECONFIG and some magic to build what the user requests.

By default we build all the tools which have no dependencies, and the tools
which need GTK+ 2 or GTK+ 3 if the relevant DISTRO_FEATURES are enabled.

Add a patch to fix the build of ld10k1 with musl.

The ncurses build dependency doesn't seem to be checked for, so remove that.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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