run-tests: allow hg executable to be hg.exe

When running tests on Windows (via msys), user sometimes does not want to run
them against source hg, but against compiled hg.exe. For that purpose,
--with-hg option can be used, but currently run-tests.py prints a warning if
the value of this argument is not a file with basename 'hg'. This patch allows
such file to be 'hg.exe'.

tests/run-tests.py

@@ -357,7 +357,7 b' def parseargs(args, parser):'
         if not (os.path.isfile(options.with_hg) and
                 os.access(options.with_hg, os.X_OK)):
             parser.error('--with-hg must specify an executable hg script')
-        if not os.path.basename(options.with_hg) == b'hg':
+        if os.path.basename(options.with_hg) not in [b'hg', b'hg.exe']:
             sys.stderr.write('warning: --with-hg should specify an hg script\n')
     if options.local:
         testdir = os.path.dirname(_bytespath(canonpath(sys.argv[0])))