Update sccache to 0.2.7

Author: SimonSapin

servo-build-dependencies/ci-map.jinja

@@ -2,20 +2,20 @@
   set sccache = salt['grains.filter_by']({
       'defaults': {
         'destination': '/usr/local/bin/sccache',
-        'version': '2018-01-09',
+        'version': '0.2.7',
       },
       'MacOS': {
         'platform': 'x86_64-apple-darwin',
-        'sha384': 'cd8dac86c250e8b5c59e231dc413ead48e97e7c9630d9a30ae1f9b16d738ac8004ebbdfe04351df71ced582f4022393d'
+        'sha384': 'd996dda9cd1398603470b14c2e1f503604ab2b97bebca04c955cecafe4943e637086d35264726d0638077a0cb30e67b5'
       },
       'Ubuntu': {
         'platform': 'x86_64-unknown-linux-musl',
-        'sha384': '6f005785e1178b30b3629dd1c69539a1df608216309ec9cded093e5447e9787cb462f36c7025a7564f3c4c93e0e4a8a2'
+        'sha384': '8fee357dfade760bb85c8c22203f145b6cf8d8a8216570fc006794910b925b7edf5f6d67cc4b129c6c3652521906e024'
       },
       'Windows': {
         'destination': 'C:\sccache\sccache.exe',
         'platform': 'x86_64-pc-windows-msvc',
-        'sha384': '2f25ee8e1e21bced7af8c16c4c94831d188729588eeef72f494b0af620a04d25635d6f939842db6a8fddb3beb27460e1'
+        'sha384': 'f1d2720a1910e5ffdeda9ef2c73724b5f66a8e47c6ced1068cd04cde603fd8b4b8c34362616e3368816826ca9ec90b6b'
       }
     },
     base='defaults',

servo-build-dependencies/ci.sls

@@ -4,7 +4,8 @@
 sccache:
   file.managed:
     - name: {{ sccache.destination }}
-    - source: https://servo-deps.s3.amazonaws.com/sccache/{{ sccache.version }}-sccache-{{ sccache.platform }}
+    - source: https://github.com/mozilla/sccache/releases/download/{{ sccache.version }}/sccache-{{ sccache.version }}-{{ sccache.platform }}.tar.gz
+    https://servo-deps.s3.amazonaws.com/sccache/{{ sccache.version }}-sccache-{{ sccache.platform }}
     - source_hash: sha384={{ sccache.sha384 }}
     - user: {{ root.user }}
     {% if grains['os'] != 'Windows' %}