[bug-patch] in 2.7.1, empty directories are not removed

[Thomas Moschny]

Test:

mkdir dir
echo -n foobar > dir/file
cat <<EOF >apatch
--- dir/file
+++ /dev/null   
@@ -1 +0,0 @@
-foobar
\ No newline at end of file
EOF
patch -p0 < apatch
ls -al dir # should fail

In 2.6.1, this removed file 'file' and then dir 'dir'. In 2.7.1, it
only removes 'file' and 'dir' is kept.

The man page reads: "When patch removes a file, it also attempts to
remove any empty ancestor directories."