Merge branch 'ml/cygwin-does-not-have-fifo'

* ml/cygwin-does-not-have-fifo:
  test-lib.sh - cygwin does not have usable FIFOs

Author: gitster

t/test-lib.sh

@@ -885,7 +885,14 @@ test_i18ngrep () {
 
 test_lazy_prereq PIPE '
 	# test whether the filesystem supports FIFOs
-	rm -f testfifo && mkfifo testfifo
+	case $(uname -s) in
+	CYGWIN*)
+		false
+		;;
+	*)
+		rm -f testfifo && mkfifo testfifo
+		;;
+	esac
 '
 
 test_lazy_prereq SYMLINKS '