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>

src/testdir/test_crash.vim

@@ -7,6 +7,8 @@ CheckScreendump
 func Test_crash1()
   CheckNotBSD
   CheckExecutable dash
+  " Test 7 fails on Mac ... 
+  CheckNotMac
 
   " The following used to crash Vim
   let opts = #{cmd: 'sh'}

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1881,
 /**/
     1880,
 /**/