Pedantically proper quoting.

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@787 0c269be4-1314-0410-8aa9-9f06e86f4224

acinclude.m4

@@ -5,7 +5,7 @@ dnl will set SYSCONFDIR to /usr/local/etc
 
 dnl written by thomas vander stichele
 
-AC_DEFUN(AS_AC_EXPAND,
+AC_DEFUN([AS_AC_EXPAND],
 [
   EXP_VAR=[$1]
   FROM_VAR=[$2]