squeezelite: Remove codec auto configuration

squeezelite: Remove codec auto configuration

.. because it's confusing and doesn't seem to add any value.

The "auto configuration" looks for installed codec libraries and tells
squeezelite (through command line arguments) to exclude codec support if a
required library is missing.

If you have installed squeezelite-full, then all required codec libraries
are automatically installed as dependencies and the squeezelite binary won't
even run if there are missing libraries - ie the "auto configuration" will
always find all codecs and never disable any codecs. Toggling "auto
configuration" makes no difference and the setting is just confusing.

If you install squeezelite-mini the "auto configuration" can work, but
library checks are already done by dlopen() calls in squeezelite and codecs
are disabled if the necessary libraries are not found - ie the "auto
configuration" duplicates the library checks of squeezelite itself.

Signed-off-by: Robert Högberg <robert.hogberg@gmail.com>