REGRESSION(227811@main): run-webkit-tests reports "perl: warning: Set…

…ting locale failed." on Windows

https://bugs.webkit.org/show_bug.cgi?id=259640

Reviewed by Don Olmstead.

After 227811@main set a environment vairable 'LC_ALL' to
'en_US.UTF-8', run-webkit-tests reports "perl: warning: Setting locale
failed." on Windows.

> perl: warning: Setting locale failed.
> perl: warning: Please check that your locale settings:
> 	LC_ALL = "en_US.UTF-8",
> 	LC_MESSAGES = "en_US.UTF-8",
> 	LANG = "en_US.UTF-8"
>     are supported and installed on your system.
> perl: warning: Falling back to the standard locale ("C").

* Tools/Scripts/webkitpy/common/host.py:
(Host._engage_awesome_locale_hacks):
Do nothing on Windows.

Canonical link: https://commits.webkit.org/266671@main

Tools/Scripts/webkitpy/common/host.py

@@ -76,6 +76,8 @@ def web(self):
     # We call this from the Host constructor, as it's one of the
     # earliest calls made for all webkitpy-based programs.
     def _engage_awesome_locale_hacks(self):
+        if sys.platform.startswith('win'):
+            return
         # To make life easier on our non-english users, we override
         # the locale environment variables inside webkitpy.
         # If we don't do this, programs like SVN will output localized