This eliminates some overhead, because the compiler doesn't need to
consider these functions throwing.

Replaces g_ascii_strup() and allows building the Vorbis encoder
without GLib.

Replaces g_str_has_suffix().

Replaces g_strstrip().

Replaces GLib's g_str_has_prefix().

Overload the name.

Eliminate the fallback strndup() and strnlen() implementations.

Usually, when strndup() is not available, strndup() isn't either,
because both are POSIX 2008.

This patch also adds extern "C" { } wrapper around string_util.h
to allow its usage in C++ code

Remove GLib dependency from some headers.

Replace g_strchug() calls with a cheaper implementation.

It's not used anymore, its features have been moved to fd_util.c.

No CamelCase.  Use bool instead of int.  Make both arguments
mandatory.

This updates the copyright header to all be the same, which is
pretty much an update of where to mail request for a copy of the GPL
and the years of the MPD project. This also puts all committers under
'The Music Player Project' umbrella. These entries should go
individually in the AUTHORS file, for consistancy.

Now that I've found this nice function in the GLib docs, we can
finally remove our custom sleep function.  Still all those callers of
g_usleep() have to be migrated one day to use events, instead of
regular polling.