Fix building of Shishi with libgcrypt 1.6 and later.

Patch copied from Debian:

https://anonscm.debian.org/cgit/collab-maint/shishi.git/tree/debian/patches/fix_gcrypt_detection.diff?id=948301ae648a542a408da250755aeed58a6e3542

Description: Fix autoconf gnutls detection to also accept gcrypt 1.6.
Author: Andreas Metzler <ametzler@debian.org>
Bug-Debian: http://bugs.debian.org/753150
Origin: vendor
Forwarded: no
Last-Update: 2014-07-18

--- shishi-1.0.2.orig/gl/m4/gc.m4
+++ shishi-1.0.2/gl/m4/gc.m4
@@ -12,10 +12,12 @@ AC_DEFUN([gl_GC],
   if test "$libgcrypt" != no; then
     AC_LIB_HAVE_LINKFLAGS([gcrypt], [gpg-error], [
 #include <gcrypt.h>
-/* GCRY_MODULE_ID_USER was added in 1.4.4 and gc-libgcrypt.c
-   will fail on startup if we don't have 1.4.4 or later, so
-   test for it early. */
-#if !defined GCRY_MODULE_ID_USER
+/* gc-libgcrypt.c will fail on startup if we don't have libgcrypt 1.4.4 or
+   later, test for it early. by checking for either
+   - GCRY_MODULE_ID_USER which was added in 1.4.4 and dropped in 1.6 or
+   - GCRYPT_VERSION_NUMBER which was added in 1.6.
+   */
+#if !defined GCRY_MODULE_ID_USER && !defined GCRYPT_VERSION_NUMBER
 error too old libgcrypt
 #endif
 ])
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<tr><td><span title='2018-03-17 16:37:27 +0100'>2018-03-17</span></td><td><a href='/guix/commit/gnu/packages/sml.scm?id=c695fb769c94623371c5997da1dc454b0a4f58a8'>gnu: Fix common unquote typos.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-12-13 14:18:51 +0100'>2017-12-13</span></td><td><a href='/guix/commit/gnu/packages/sml.scm?id=c2c5b115ab0d855ed96065043fd22574fb69093a'>gnu: polyml: Update to 5.7.1.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-07-17 15:13:41 +0200'>2017-07-17</span></td><td><a href='/guix/commit/gnu/packages/sml.scm?id=9b7ee28d5700b47ae34bd47c32d250f042fbdbbd'>gnu: Add Poly/ML.</a><span class='msg-avail'>...</span></td><td>Andy Patterson</td></tr>