Fix live555media libraries link order

Since at least vlc 1.0.2, compiling vlc with a static version of a
recent version of the live555media library (the version released on
2009/11/12 for instance) results in the following warning while loading
the liblive555_plugin.so module:

[0x1901090] main libvlc warning: cannot load module `/usr/local/lib/vlc/demux/liblive555_plugin.so' (/usr/local/lib/vlc/demux/liblive555_plugin.so: undefined symbol: _ZTI9HashTable)

This warning is due to an error in the link order of the
live555_plugin, fixed by the following patch.
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

configure.ac

@@ -2015,10 +2015,10 @@ lternatively you can use --disable-live555 to disable the liveMedia plugin.])
         VLC_ADD_LIBS([live555],[-lws2_32])
       fi
 
-      VLC_ADD_LIBS([live555],[-L${real_live555_tree}/liveMedia -lliveMedia])
+      VLC_ADD_LIBS([live555],[-L${real_live555_tree}/UsageEnvironment -lUsageEnvironment])
       VLC_ADD_LIBS([live555],[-L${real_live555_tree}/BasicUsageEnvironment -lBasicUsageEnvironment])
       VLC_ADD_LIBS([live555],[-L${real_live555_tree}/groupsock -lgroupsock])
-      VLC_ADD_LIBS([live555],[-L${real_live555_tree}/UsageEnvironment -lUsageEnvironment])
+      VLC_ADD_LIBS([live555],[-L${real_live555_tree}/liveMedia -lliveMedia])
 
       VLC_ADD_CXXFLAGS([live555],[-I${real_live555_tree}/BasicUsageEnvironment/include])
       VLC_ADD_CXXFLAGS([live555],[-I${real_live555_tree}/groupsock/include])