gobject/tests/performance: Only run a quick version as installed-tests

ginsttest-runner defaults to timing out each test after 5 minutes,
but gobject/tests/performance/performance.c defaults to running each
of 18 tests for 15 seconds. The result is close enough to 5 minutes
that the setup overhead is enough to make it time out.

We're only running these tests to prove that they still work, not to
get meaningful performance numbers, so cut them down to 1 second per
test-case (the result of which is that performance.c takes about a
minute).

Signed-off-by: Simon McVittie <smcv@collabora.com>

gobject/tests/performance/meson.build

@@ -20,7 +20,7 @@ foreach test_name, extra_args : gobject_tests
   if install
     test_conf = configuration_data()
     test_conf.set('installed_tests_dir', installed_tests_execdir)
-    test_conf.set('program', test_name)
+    test_conf.set('program', '@0@ --seconds 1'.format(test_name))
     test_conf.set('env', '')
     configure_file(
       input: installed_tests_template,