patch 9.0.1881: Test_crash fails on Mac

Problem:  Test_crash fails on Mac
Solution: Skip test on Mac

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index a3d6ed0..3778d01 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1881,
+/**/
     1880,
 /**/
     1879,