playlist: do not add playlist base path to URLs

The entries of a playlist file usually refer either to local files (in
the same directory as the playlist), or absolute paths like URLs. In
the first case, you want to add the base path of the playlist file to
the files, so that mplayer can find the files. In the second case, the
URLs should not be changed.

Unfortunately, mp_path_join() recognizes URLs as relative paths, and
changes them. E.g. it tried to play /path/to/playlist/http://entry.

Add some code to deal with this properly. The added code uses the same
approach as m_option_type_custom_url in m_option.c, but because it's
so short and trivial, it's perhaps better not to rely on the option
parser code.

It's also unclear whether mp_path_join() should contain this logic,
but maybe it's better to keep the logic of that function clean.

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