patch 9.1.1100: tests: Test_log_nonexistent only works on Linux

Problem:  tests: Test_log_nonexistent only works on Linux
          (after v9.1.1097)
Solution: Add CheckUnix condition

closes: #16476

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

Author: chrisbra

src/testdir/test_startup.vim

@@ -743,6 +743,7 @@ endfunc
 func Test_log_nonexistent()
   " this used to crash Vim
   CheckFeature channel
+  CheckUnix
   let result = join(systemlist(GetVimCommand() .. ' --log /X/Xlogfile -c qa!'))
   call assert_match("E484: Can't open file", result)
 endfunc

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1100,
 /**/
     1099,
 /**/