Due to recent protocol additions ("addtagid", "cleartagid").

The DynamicFifoBuffer methods never return nullptr when the buffer is
empty or full; instead, they return an empty buffer.  This bug caused
an endless loop.

Switch to the C++ version.

This deadlock was a regression by commit 8e38b4f8.  Since we currently
can't resolve this, let's revert the commit, and add a GLib specific
workaround for the build failure.

Avoid GLib.

Allows building without GLib.  This fails to compile currently,
because GLib is still used in the MPD core.

Avoid GLib.

Prepare for GLib removal.

Replaces g_uri_parse_scheme().

Don't duplicate the buffer just to null-terminate the string.
According to libFLAC API documentation, the string is already
null-terminated.

To replace g_strdup().

Move code from the "mad" plugin.

Move code from the "mad" plugin.

File generated by automake version 1.14.

Fixes broken CUE sheet song tags (regression by commmit 7e8d254b).