t9501: Skip testing load if we can't detect it

Currently gitweb only knows how to check for load using /proc/loadavg,
which isn't available on all systems.  We shouldn't fail the test just
because we don't know how to check the system load.

Signed-off-by: Brian Gernhardt <brian@gernhardtsoftware.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9501-gitweb-standalone-http-status.sh

@@ -115,12 +115,19 @@ test_debug 'cat gitweb.output'
 # ----------------------------------------------------------------------
 # load checking
 
+if test -e /proc/loadavg
+then
+	test_set_prereq PROC_LOADAVG
+else
+	say 'skipping load tests (no /proc/loadavg found)'
+fi
+
 # always hit the load limit
 cat >>gitweb_config.perl <<\EOF
 our $maxload = 0;
 EOF
 
-test_expect_success 'load checking: load too high (default action)' '
+test_expect_success PROC_LOADAVG 'load checking: load too high (default action)' '
 	gitweb_run "p=.git" &&
 	grep "Status: 503 Service Unavailable" gitweb.headers &&
 	grep "503 - The load average on the server is too high" gitweb.body