License validation tweaks for webpki.

1) Tweak ISC license

Change author --> authors and eliminate a stray space. It now correctly
recognizes crates/inotify/LICENSE, and the other ISC licensed crates
(inotify, inotify-sys, libloading, untrusted) are still detected
correctly due to fuzzy matching.

2. Find crates/webpki/third-party/chromium/LICENSE.

These two changes make webpki pass license validation.

Test: ./crate_tool fix-licenses inotify inotify-sys libloading untrusted webpki
Change-Id: Ie7188d042c59e13006f2d28b732036c1ac7eda7f

tools/external_crates/license_checker/src/license_file_finder.rs

@@ -31,6 +31,7 @@ static LICENSE_GLOBS: &[&str] = &[
     "COPYING",
     "license",
     "license.*",
+    "third-party/chromium/LICENSE",
 ];
 
 pub(crate) fn find_license_files(

tools/external_crates/license_checker/src/licenses/ISC.txt

@@ -1,10 +1,10 @@
-Permission to use, copy, modify, and /or distribute this software for
+Permission to use, copy, modify, and/or distribute this software for
 any purpose with or without fee is hereby granted, provided that the
 above copyright notice and this permission notice appear in all copies.
 
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF