Fixes broken D-Bus detection

Thanks to Daniel Stränger

configure.ac

@@ -865,7 +865,7 @@ then
           VLC_ADD_CFLAGS([dbus],[$DBUS_CFLAGS])
         fi],
     dnl not too old dbus
-    PKG_CHECK_MODULES(DBUS, dbus-1 >= 0.92,
+    [ PKG_CHECK_MODULES(DBUS, dbus-1 >= 0.92,
       [ AC_DEFINE( HAVE_DBUS_2, 1, [Define if you have the D-BUS library API >= 0.92] )
         AC_DEFINE( HAVE_DBUS_1, 1, [Define if you have the D-BUS library API >= 0.30] )
         AC_DEFINE( HAVE_DBUS, 1, [Define if you have the D-BUS library] )
@@ -885,7 +885,7 @@ then
            [AC_MSG_WARN(DBUS library not found)])
         ]
       )]
-    )
+    )]
   )
 fi