selftest/devtool: Update to account for recipe specific sysroot

There is no common sysroot any more so add the libusb dependency using DEPENDS
and check for the output in the sysroot output directory so the tests
work with recipe specific sysroots.

(From OE-Core rev: ff30b833a423d300ec2b81bf80ef6733a6d8039b)

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

meta/lib/oeqa/selftest/devtool.py

@@ -247,8 +247,6 @@ class DevtoolTests(DevtoolBase):
 
     @testcase(1162)
     def test_devtool_add_library(self):
-        # We don't have the ability to pick up this dependency automatically yet...
-        bitbake('libusb1')
         # Fetch source
         tempdir = tempfile.mkdtemp(prefix='devtoolqa')
         self.track_for_cleanup(tempdir)
@@ -277,10 +275,13 @@ class DevtoolTests(DevtoolBase):
         result = runCmd('recipetool setvar %s EXTRA_OECMAKE -- \'-DPYTHON_BINDINGS=OFF -DLIBFTDI_CMAKE_CONFIG_DIR=${datadir}/cmake/Modules\'' % recipefile)
         with open(recipefile, 'a') as f:
             f.write('\nFILES_${PN}-dev += "${datadir}/cmake/Modules"\n')
+            # We don't have the ability to pick up this dependency automatically yet...
+            f.write('\nDEPENDS += "libusb1"\n')
+            f.write('\nTESTLIBOUTPUT = "${STAGING_DIR}-components/${TUNE_PKGARCH}/${PN}/${libdir}"\n')
         # Test devtool build
         result = runCmd('devtool build libftdi')
-        staging_libdir = get_bb_var('STAGING_LIBDIR', 'libftdi')
-        self.assertTrue(staging_libdir, 'Could not query STAGING_LIBDIR variable')
+        staging_libdir = get_bb_var('TESTLIBOUTPUT', 'libftdi')
+        self.assertTrue(staging_libdir, 'Could not query TESTLIBOUTPUT variable')
         self.assertTrue(os.path.isfile(os.path.join(staging_libdir, 'libftdi1.so.2.1.0')), "libftdi binary not found in STAGING_LIBDIR. Output of devtool build libftdi %s" % result.output)
         # Test devtool reset
         stampprefix = get_bb_var('STAMP', 'libftdi')