Merge branch 'ad/t1800-cygwin'

Test fix.

* ad/t1800-cygwin:
  t1800: correct test to handle Cygwin

Author: gitster

t/t1800-hook.sh

@@ -157,9 +157,9 @@ test_expect_success 'git hook run a hook with a bad shebang' '
 	write_script bad-hooks/test-hook "/bad/path/no/spaces" </dev/null &&
 
 	# TODO: We should emit the same (or at least a more similar)
-	# error on Windows and !Windows. See the OS-specific code in
-	# start_command()
-	if test_have_prereq !WINDOWS
+	# error on MINGW (essentially Git for Windows) and all other
+	# platforms.. See the OS-specific code in start_command()
+	if test_have_prereq !MINGW
 	then
 		cat >expect <<-\EOF
 		fatal: cannot run bad-hooks/test-hook: ...