oeqa/recipetool: Fix symlink resolution

Instead of readlink we need to use realpath to resolve any possible
symlink in the file name. I'd got the two confused in the previous
patch. This should really fix selftest failures on the autobuilder.

(From OE-Core rev: 878764ab7252f9b5b67b697dcd51b961b673fda0)

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

meta/lib/oeqa/selftest/recipetool.py

@@ -112,7 +112,7 @@ class RecipetoolTests(DevtoolBase):
     def test_recipetool_appendfile_binary(self):
         # Try appending a binary file
         # /bin/ls can be a symlink to /usr/bin/ls
-        ls = os.readlink("/bin/ls")
+        ls = os.path.realpath("/bin/ls")
         result = runCmd('recipetool appendfile %s /bin/ls %s -r coreutils' % (templayerdir, ls))
         self.assertIn('WARNING: ', result.output)
         self.assertIn('is a binary', result.output)