It was an error that we had a win-7 platform to begin with. Windows 7 was the most recent
version of Windows we cared about, so its results should just go in win. But now that
Windows 7 SP1 exists (and has different results for some tests), we need a place to store
results for Windows 7 without SP1 (and older versions of Windows).

Part of <http://webkit.org/b/56617> Several tests fail on Windows 7 SP1 due to font
differences from Windows 7 "SP0"

Reviewed by David Kilzer.

* Scripts/old-run-webkit-tests: Replaced win-7 with win-7sp0. Newer versions of Windows 7
will just use "win".

* Scripts/webkitdirs.pm:
(isWindows7SP0): Added. Replaces isWindows7, because that function had no remaining callers.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@84377 268f45cc-cd09-0410-ab3c-d52691b4dbfc