libexif is now libjhead

b/12203995
Change-Id: I78c3eae1dc3a3e37da182513078749ad83d6d004
am 0fbe7ecf: libexif is now libjhead

* commit '0fbe7ecfb0a526c02b774208fa00e0cba19d13a4':
  libexif is now libjhead
auto-merger: merge in from aosp/master