Do not enable GNU TLS in default build


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4050 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/configure.ac b/configure.ac
index 3177963..3a9ad92 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,7 +72,7 @@
 AC_ARG_ENABLE([gnutls],
 	AS_HELP_STRING([--enable-gnutls],
 		       [build in GNUTLS based encryption support (default yes)]),
-	[enable_gnutls="$enableval"], [enable_gnutls=yes])
+	[enable_gnutls="$enableval"], [enable_gnutls=no])
 GNUTLS_CFLAGS=
 GNUTLS_LIBS=
 if test "x$enable_gnutls" = xyes; then