[Toybox] imgtec patch: Fix static linkage of toybox binary.

[enh]

imgtec sent us https://android-review.googlesource.com/#/c/223060/

Fix static linkage of toybox binary.

If toybox was compiled statically e.g. for use in a recovery ramdisk,
it would not build after b66a29a. This is because libselinux already
exports a selinux_log_callback() function which getprop.c is trying
to override.

This change simply makes the second symbol static, since it is only
used in a function table so we do not actually need to export it
from toybox.

Change-Id: I603258877ae2286660df35738bbf4f4285df5b54
Signed-off-by: Alistair Strachan <alistair.strachan at imgtec.com>



the git cherrypick copy & paste (from the top-right in the gerrit UI) is:

git fetch https://android.googlesource.com/platform/external/toybox
refs/changes/60/223060/1 && git cherry-pick FETCH_HEAD

-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.