[PATCH] t0090: mark add-interactive test with PERL prerequisite

[Jeff King <peff@peff.net>]

The add-interactive system is built in perl. If you build
with NO_PERL, running "git commit --interactive" will exit
with an error and the test will fail.

Signed-off-by: Jeff King <peff@peff.net>
---
Noticed by Michael while working around gitweb failures by setting
NO_PERL. :)

It didn't reproduce for me in my existing build directory, presumably
because I had an old git-add--interactive build product lying around.
But running the tests in a clean clone with NO_PERL set reproduces
easily.

 t/t0090-cache-tree.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 158cf4f..067f4c6 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh
@@ -131,7 +131,7 @@ test_expect_success 'second commit has cache-tree' '
 	test_cache_tree
 '
 
-test_expect_success 'commit --interactive gives cache-tree on partial commit' '
+test_expect_success PERL 'commit --interactive gives cache-tree on partial commit' '
 	cat <<-\EOT >foo.c &&
 	int foo()
 	{
-- 
2.1.2.596.g7379948