selftest/package: Fix hardlink test when using sstate

The build target won't cause the package task to run if things were already
built and in sstate. Ensure we run the package task explicitly to ensure
the test works as intended.

(From OE-Core rev: be20eb4f4ad77d9444028ca9632b74d5866d96b8)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/package.py

@@ -89,7 +89,7 @@ class VersionOrdering(OESelftestTestCase):
 class PackageTests(OESelftestTestCase):
     # Verify that a recipe which sets up hardlink files has those preserved into split packages
     def test_preserve_hardlinks(self):
-        result = bitbake("selftest-hardlink")
+        result = bitbake("selftest-hardlink -c package")
 
         dest = get_bb_var('PKGDEST', 'selftest-hardlink')
         bindir = get_bb_var('bindir', 'selftest-hardlink')