configure: fix udev rules for cmd line DIR

alsa-utils configure was ignoring the --with-udev-rules-dir command
line argument when running configure. Fix it.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lgirdwood

configure.ac

@@ -218,7 +218,7 @@ AC_ARG_WITH(
         if test "x$udevdir" = "x"; then
             udevrulesdir="/lib/udev/rules.d"
         else
-            udevrulesdir="$udevdir/rules.d"
+            udevrulesdir="$udevrulesdir/rules.d"
         fi])
 AC_SUBST(udevrulesdir)