1. src/net tests abstracted into XIPH_NET macro. We should do the same for
src/thread, but it's a little more complicated - it will have to
interact with the caller (eg some apps may want --disable-threads)
2. uintxx_t, socklen_t tests encapsulated, moved to xiph_types.m4
3. solaris fixes for socket func, nanosleep detection
4. added $LIBS to SHOUT_LIBS for *-config scripts. Good or bad idea?
We'll definitely need a libshout beta 2.
svn path=/trunk/m4/; revision=5005
