Fix win/configure.js: now configure.in has AM_INIT_AUTOMAKE(mariadb, ...)

- Part 2. make it really work.

win/configure.js

@@ -157,11 +157,15 @@ function GetVersion(str)
 {
     var key = "AM_INIT_AUTOMAKE(mysql, ";
     var key2 = "AM_INIT_AUTOMAKE(mariadb, ";
+    var key_len = key.length;
     var pos = str.indexOf(key); //5.0.6-beta)
     if (pos == -1)
+    {
       pos = str.indexOf(key2);
+      key_len= key2.length;
+    }
     if (pos == -1) return null;
-    pos += key.length;
+    pos += key_len;
     var end = str.indexOf(")", pos);
     if (end == -1) return null;
     return str.substring(pos, end);