configure.ac: Because of the ld text relocation bug on Mac OS X, we have to disable ffmpeg when using such linker for the time being. Add a big warning at the end of configure if we are in such a configuration.

 * share/luaintf/http.lua: Equivalent of the legacy modules/control/http/
   module. (The new module takes 272 lines of Lua, instead of 5475 lines for
   the old one.) Functionality is basically the same except for CGI support
   which is missing.
 * share/http-lua/: The HTML files using the new <?vlc [lua code] ?> syntax.
 * modules/misc/lua/: Add Lua bindings for a few VLC function, the most
   important being the HTTPd high level functions, ACLs, stat and opendir.

The Lua code still needs to be cleaned up a bit.

contrib/ffmpeg-macosx-intel-mmx.patch: Use Graham Booker's patch which works around the ld64 text relocation bug.

* disable ASM support in libtheora for now (until the authors release a fixed version or Apple a fixed ld)

But it may be useless, because of our mpc demuxer...

Return the p_sys pointer in the httpd_{Handler,File}Delete functions (in case you need it to clean up stuff).