checklicenses: remove libwebp from path whitelist

third_party/devscripts/licensecheck.pl

Index: third_party/devscripts/licensecheck.pl
diff --git a/third_party/devscripts/licensecheck.pl b/third_party/devscripts/licensecheck.pl
index bd60603ee564952f83c5f7e0d2253c77bd875056..c6c6e85e36aa07845eaf28b8c3065463b4a5691e 100755
--- a/third_party/devscripts/licensecheck.pl
+++ b/third_party/devscripts/licensecheck.pl
@@ -473,6 +473,8 @@ sub parselicense($) {
 	} else {
 	    $license = "BSD $license";
 	}
+    } elsif ($licensetext =~ /This code is licensed under the same terms as WebM/) {
+        $license = "BSD (3 clause) $license";
     } elsif ($licensetext =~ /Use of this source code is governed by a BSD-style license/) {
         $license = "BSD-like $license";
     } elsif ($licensetext =~ /BSD terms apply/) {