patch 9.1.0203: build-error on GNU/Hurd

Problem:  build-error on GNU HURD
Solution: Define _XOPEN_SOURCE like for Android and Cygwin
          (James McCoy)

strptime() requires _XOPEN_SOURCE to be defined for its declaration to
be visible.  This is already done for non-Android Linux and Cygwin, but
also needs to be exposed for GNU/Hurd.

closes: #14285

Signed-off-by: James McCoy <jamessan@jamessan.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index e074aeb..5f56d44 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    203,
+/**/
     202,
 /**/
     201,