Bionic doesn't have the SYS_* macros.

Use it if it exists, but don't insist if the C library is poor
(e.g. Bionic/Android).

Bionic's pthread declarations are non-literal.

Required for building without GLib.

Replaces g_str_has_suffix().

Temporary hack for the experimental no-GLib build.

Replaces g_strstrip().

This is misconfiguration, and MPD should abort.

Fixes nullptr dereference.

Add the new idle event to Idle.hxx/Idle.cxx.

Playback with some decoder plugins was broken because the Queue's
DetachedSong instances did not have the "real" URI (the mapped path).

This is the backend for the upcoming "mount" command.