FaceDetect: Catch linker errors during initialization

Right now we only check if we can load the native
functions from the JNI, but unsatisfied linker errors
can still occur even if the lib is present.

Change-Id: Id2ac36374eb8341b278949d120dc7674d6d62691
(cherry picked from commit c44c4c3555bc7eadb0f0d35cd082ed90ef5731e2)
Signed-off-by: Alex Naidis <alex.naidis@linux.com>