patch 9.0.1872: CI: test_crash() fails on CI

Problem:  CI: test_crash() fails on CI
Solution: Skip test on BSD

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_crash.vim

@@ -5,6 +5,8 @@ source screendump.vim
 CheckScreendump
 
 func Test_crash1()
+  CheckNotBSD
+
   if !executable('sh')
     throw 'Skipped: sh not executable!'
   endif