Rename libexif to libjhead, since that's what it is

b/12203995
Change-Id: Ide9dfc4a6486fb8ae66724099bc7f3d4083d13c7
Merge tag 'android-4.4.3_r1.1' into cm-10.2

Android 4.4.3 release 1.1

# gpg: error loading `iconv.dll': The specified module could not be found.
#
# gpg: please see http://www.gnupg.org/download/iconv.html for more information
# gpg: keyring `C:/Users/Build02/AppData/Roaming/gnupg\pubring.gpg' created
# gpg: Signature made 06/02/14 19:31:02 using DSA key ID 9AB10E78
# gpg: Can't check signature: public key not found