Use AS_VAR_SET with widl

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@5182 4407c894-4637-0410-b4f5-ada5f102cad1

mingw-w64-headers/configure

diff --git a/mingw-w64-headers/configure b/mingw-w64-headers/configure
index 459acb2..2acbc7e 100755
--- a/mingw-w64-headers/configure
+++ b/mingw-w64-headers/configure
@@ -2452,7 +2452,7 @@
 
 case $with_widl in #(
   no) :
-    with_widl="" ;; #(
+    with_widl= ;; #(
   yes) :
     with_widl="mingw-w64-widl widl" ;; #(
   *) :

mingw-w64-headers/configure.ac

diff --git a/mingw-w64-headers/configure.ac b/mingw-w64-headers/configure.ac
index bce1ac0..7c08346 100644
--- a/mingw-w64-headers/configure.ac
+++ b/mingw-w64-headers/configure.ac
@@ -23,8 +23,8 @@
   [with_widl=no])
 
 AS_CASE([$with_widl],
-  [no],[with_widl=""],
-  [yes],[with_widl="mingw-w64-widl widl"],
+  [no],[AS_VAR_SET([with_widl])],
+  [yes],[AS_VAR_SET([with_widl],["mingw-w64-widl widl"])],
   [])
 AC_PATH_PROGS([WIDL], [$with_widl], [])
 AM_CONDITIONAL([HAVE_WIDL],[AS_VAR_TEST_SET([WIDL])])