Bug 1413185 - Remove obsolete license whitelist entry. r=froydnj

DONTBUILD because this only gets run as part of a manual `mach vendor rust`
invocation and won't run in a regular CI run.

MozReview-Commit-ID: FMym1BsEAFe

--HG--
extra : rebase_source : 0da389780e7c90da5593095be572ffc7dde7f35f

python/mozbuild/mozbuild/vendor_rust.py

@@ -164,8 +164,6 @@ Please commit or stash these changes before vendoring, or re-run with `--ignore-
         # reviewed solely by a build peer; any additions must be checked by
         # somebody competent to review licensing minutiae.
         LICENSE_FILE_PACKAGE_WHITELIST = {
-            # Google BSD-like license; some directories have separate licenses
-            'gamma-lut': '1f04103e3a61b91343b3f9d2ed2cc8543062917e2cc7d52a739ffe6429ccaf61',
             # MIT
             'deque': '6485b8ed310d3f0340bf1ad1f47645069ce4069dcc6bb46c7d5c6faf41de1fdb',
         }