configure: Make sure timezone and daylight are variables.
diff --git a/configure b/configure
index b2d5370..ca41210 100755
--- a/configure
+++ b/configure
@@ -23652,7 +23652,7 @@
 int
 main ()
 {
-timezone;
+timezone = 1
   ;
   return 0;
 }
@@ -23727,7 +23727,7 @@
 int
 main ()
 {
-daylight;
+daylight = 1
   ;
   return 0;
 }