No bug - Don't write artifacts twice. r=me

DONTBUILD NPOTB

This was just an oversight during the initial landing, leading to two
copies of artifact libraries being appended to the same destination
file.

--HG--
extra : commitid : JvvZDrjUOQZ
extra : rebase_source : f48c1a9d4b506b6ed931043aeeaca437418ea9c3
extra : histedit_source : 3dbfd049039c0adc595c1abb0df3dca3af9db207

python/mozbuild/mozbuild/artifacts.py

@@ -325,7 +325,6 @@ class Artifacts(object):
                 n = os.path.join(distdir, 'bin', os.path.basename(info.filename))
                 fh = FileAvoidWrite(n, mode='r')
                 shutil.copyfileobj(zf.open(info), fh)
-                fh.write(zf.open(info).read())
                 file_existed, file_updated = fh.close()
                 self.log(logging.INFO, 'artifact',
                     {'updating': 'Updating' if file_updated else 'Not updating', 'filename': n},