bpo-45506: Stop skipping test_embed. (gh-29300)

In gh-29063 I ended up disabling test_embed on non-Windows by accident. This gets it running again.

https://bugs.python.org/issue45506

Author: ericsnowcurrently

Lib/test/test_embed.py

@@ -58,10 +58,12 @@ def setUp(self):
             ext = ("_d" if debug_build(sys.executable) else "") + ".exe"
             exename += ext
             exepath = builddir
+            expecteddir = support.REPO_ROOT
         else:
             exepath = os.path.join(builddir, 'Programs')
+            expecteddir = os.path.join(support.REPO_ROOT, 'Programs')
         self.test_exe = exe = os.path.join(exepath, exename)
-        if exepath != support.REPO_ROOT or not os.path.exists(exe):
+        if exepath != expecteddir or not os.path.exists(exe):
             self.skipTest("%r doesn't exist" % exe)
         # This is needed otherwise we get a fatal error:
         # "Py_Initialize: Unable to get the locale encoding