patch 9.1.1081: has('bsd') is true for GNU/Hurd

Problem:  has('bsd') is true for GNU/Hurd
Solution: exclude GNU/Hurd from BSD feature flag
          (Zhaoming Luo)

GNU/Hurd, like Mac OS X, is a BSD-based system. It should exclude
has('bsd') feature just like what Mac OS X does. The __GNU__ pre-defined
macro indicates it's compiled for GNU/Hurd.

closes: #16580

Signed-off-by: Zhaoming Luo <zhmingluo@163.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index d8e8c0e..55cbd4f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1081,
+/**/
     1080,
 /**/
     1079,