Bug 1371871 - Do not install unnecessary files in an artifact build. r=mshal

This prevents us from redundantly installing httpd.js and httpd.manifest
from the test package during an artifact build, which interferes with
the Tup backend's handling of these files as symlinks.

MozReview-Commit-ID: LuMurUc1P36

--HG--
extra : rebase_source : 1aabd788ff71ae28434a4076d5304f611ada5d92

python/mozbuild/mozbuild/artifacts.py

@@ -138,7 +138,7 @@ class ArtifactJob(object):
         ('bin/xpcshell', ('bin', 'bin')),
         ('bin/plugins/gmp-*/*/*', ('bin/plugins', 'bin')),
         ('bin/plugins/*', ('bin/plugins', 'plugins')),
-        ('bin/components/*', ('bin/components', 'bin/components')),
+        ('bin/components/*.xpt', ('bin/components', 'bin/components')),
     }
 
     # We can tell our input is a test archive by this suffix, which happens to