run-tests: remove warning about entry point does not exist

Summary:
It breaks test-runtests.t when running with buck:
https://fburl.com/testinfra/7ui6uffp

Reviewed By: singhsrb

Differential Revision: D9436487

fbshipit-source-id: caa01f5d5c2d60cd0bd197a1d1b6269e64c98df7

tests/run-tests.py

@@ -3203,8 +3203,6 @@ class TestRunner(object):
             if os.path.exists(entrypointpath):
                 vlog("# HGPYENTRYPOINT=%s" % entrypointpath)
                 os.environ["HGPYENTRYPOINT"] = entrypointpath
-            else:
-                log("warning: entry point %s does not exist" % entrypointpath)
 
             try:
                 os.symlink(self._hgcommand, tmphgpath)