Test t9500 fails if Time::HiRes is missing

t9500-gitweb-standalone-no-errors fails: Git 1.7.9.rc2/1.7.8.4, RHEL
6.2, Perl 5.10.1.  Reverting 3962f1d756ab41c1d180e35483d1c8dffe51e0d1
fixes it.  The commit expects Time::HiRes to be present, but RedHat
has split it out to a separate RPM perl-Time-HiRes.  Better add a
comment about that, so it doesn't get re-reverted.

Or pacify the test and expect gitweb@RHEL-users to install the RPM:

--- git-1.7.9.rc2/t/gitweb-lib.sh~
+++ git-1.7.9.rc2/t/gitweb-lib.sh

@@ -113,4 +113,9 @@
 	test_done
 }
 
+perl -MTime::HiRes -e 0 >/dev/null 2>&1 || {
+	skip_all='skipping gitweb tests, Time::HiRes module not available'
+	test_done
+}
+
 gitweb_init

-- 
Hallvard