Not used anymore.

Use wchar_t for everything on Windows.  Solves a lot of filesystem
charset problems.

A few protocol feature have been added to the 0.20 branch, and thus we
should raise the protocol version in the server greeting.

This can eliminate the ad-hoc "#ifdef WIN32" and can also support other platforms lacking it as well (including Darwin 9).

The Linux feature allows writing new files to an invisible file, and
then replace the old file.  This preserves the old file if we get
interrupted by some event.

SQLite 3.7.3 is the version shipped in Debian Squeeze (oldstable);
should be old enough to be the required version.  Drop the
compatibility #ifdef.

Don't assume "-lpthread".  Just use PTHREAD_CFLAGS, as determined by
AX_PTHREAD.

Works around a linker problem with some older glibc versions: if
"-lrt" was used, then "-pthread" was implied, but only the symbols
used by librt were available.  This led to a linker error because
pthread_atfork() was not found.

So with "-lrt", autoconf decides that no pthread flag is necessary,
but in the end fails due to pthread_atfork() missing.

By checking for pthread before librt, we avoid this dependency
problem.

Replaces the old options --with-tremor-libraries and
--with-tremor-includes.

Don't imply the library's name is "vorbisidec"; use whatever we found
inside TREMOR_LIBS.

Require the version 2 which has a more sane API.

Since version 2.32, g_thread_init() is deprecated and a no-op.  Let's
upgrade that (optional) dependency so we can remove all those
g_thread_init() calls.

Only very few (minor) features still depend on GLib.