[gtk-vnc] Fix typo in NO_UNDEFINED_FLAGS name

[Daniel P. Berrange <dberrange src gnome org>]

commit 898cad78d12df0f1a0fe10d37431ce2421c595d7
Author: Doug Goldstein <cardoe cardoe com>
Date:   Mon Sep 16 14:20:09 2013 +0100

    Fix typo in NO_UNDEFINED_FLAGS name
    
    Fix typo in the configuration of the NO_UNDEFINED_FLAGS name for Cygwin.

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3a36960..10757d8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -144,7 +144,7 @@ AC_ARG_WITH(examples,
 WITH_EXAMPLES=$withval
 
 
-NO_UNDEFINED_LDFLAGS=
+NO_UNDEFINED_FLAGS=
 VERSION_SCRIPT_FLAGS=
 USE_VERSION_DEFS=0
 case "$host" in
@@ -155,7 +155,7 @@ case "$host" in
     ;;
 
   *-*-cygwin*)
-    NO_UNDEFINED_LDFLAGS="-no-undefined"
+    NO_UNDEFINED_FLAGS="-no-undefined"
     ;;
 
   *)