Missing mention of GSSAPI in MSVC's config_default.pl

Hi all,

While looking at the krb5 encryption patch, I noticed that gss was
missing from config_default.pl:
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -15,6 +15,7 @@ our $config = {
    # wal_segsize => 16,      # --with-wal-segsize, 16MB by default
    ldap      => 1,        # --with-ldap
    extraver  => undef,    # --with-extra-version=<string>
+   gss       => undef,    # --with-gssapi=<path>
    nls       => undef,    # --enable-nls=<path>
    tap_tests => undef,    # --enable-tap-tests
    tcl       => undef,    # --with-tls=<path>
Attached is a patch.

Regards,
--
Michael