Make libutils symbols protected

This change is a workaround for apps linking
libutils statically and dynamically which causes
them to crash for newer version of Android.

Bug: http://b/27313399
Change-Id: I47ac4146041b6eeef03cb605ea436719d552ec8f
(cherry picked from commit 2c7960c8d971ce37058b948f9e5e4e5ee6782cea)
1 file changed