the http prefix should not be listed as a supported prefix since this could cause it to conflict with other modules. Now use the vlc:// prefix on any streams to have mod_vlc handle the stream.

Fix up the autoconf macro to properly use the linker flags for a
statically linked library.

For some reason the running flag being set on the thread initiating the
shutdown did not propogate to the run loop thread. I couldn't find any
memory barrier functions in APR or the FS API so I am using 0MQ to send
a termination request message to the run loop thread.