Bug 1625511 [wpt PR 22498] - Ignore test suite third_party/ directories for lint, a=testonly

Automatic update from web-platform-tests
Ignore test suite third_party/ directories for lint

See web-platform-tests/rfcs#46

--

wpt-commits: a0d78a7e1b038652bc6d65170f3e994475ecff9c
wpt-pr: 22498

UltraBlame original commit: 58f3a4861472c450cdef0048ef42b0de5a935739

Author: marco-c

testing/web-platform/tests/lint.whitelist

@@ -322,6 +322,7 @@ SET TIMEOUT: acid/acid3/test.html
 *: css/tools/w3ctestlib/*
 *: resources/webidl2/*
 *: tools/*
+*: */third_party/*
 
 # Build system virtualenv
 *: css/tools/_virtualenv/*