Fix a typo in configure script that results in a wrong plugin directory.
ALSA bug#3148
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3148
esac
plugindir="$dir/$PACKAGE"
fi
-AC_DEFINE_UNQUOTED(ALSA_PLUGIN_DIR, "plugindir", [directory containing ALSA add-on modules])
+AC_DEFINE_UNQUOTED(ALSA_PLUGIN_DIR, "$plugindir", [directory containing ALSA add-on modules])
ALSA_PLUGIN_DIR="$plugindir"
AC_SUBST(ALSA_PLUGIN_DIR)