Avoid installing sccache on servo-master

top.sls

@@ -1,9 +1,6 @@
 # NOTE: Ensure all node types are covered in .travis.yml
 
 base:
-  '*':
-    - servo-build-dependencies.ci
-
   'not G@os:Windows':
     - match: compound
     - admin
@@ -21,19 +18,25 @@ base:
     - servo-build-dependencies
     - servo-build-dependencies.android
     - servo-build-dependencies.arm
+    - servo-build-dependencies.ci
 
   'servo-(mac|macpro)\d+':
     - match: pcre
     - osx
     - buildbot.slave
     - servo-build-dependencies
+    - servo-build-dependencies.ci
 
   'servo-linux\d+':
     - match: pcre
     - buildbot.slave
     - servo-build-dependencies
+    - servo-build-dependencies.ci
     - xvfb
 
+  'servo-windows\d+':
+    - servo-build-dependencies.ci
+
   'servo-master\d+':
     - match: pcre
     - git