added backward compatibility symbols for libqc-opt.so

Summary:
This is needed for N1 camera. Same thing was done for Find5 camera.
Find5 needed utext_openUChars_48
N1 needs utext_openUChars_50

Test Plan: Still better than a shared lib stub ;D

Reviewers: synergy, randall.rushing, raymanfx, donald.munn

CC: synergy

Differential Revision: http://review.codefirex.com/D304