Patch configure.ac to fix dependency.

Author: Chris Taylor <ctaylor@debian.org>
--- a/configure.ac
+++ b/configure.ac
@@ -18,7 +18,7 @@ AC_PATH_PROG(RANLIB, ranlib)
 AC_PROG_MAKE_SET
 
 # Checks for libraries.
-PKG_CHECK_MODULES(AUDACIOUS, [audacious >= 1.5],
+PKG_CHECK_MODULES(AUDACIOUS, [audclient >= 1.5],
 	[],
 	[AC_MSG_ERROR([Can't find Audacious development files.])])
 
