libevdev: update to _FORTIFY_SOURCE=3

Since this project explicitly specifies its FORTIFY level, update it to
the level CrOS wants to move to. This isn't _removed_, since it's copied
from a template file, and consistency with that seems useful.

BUG=b:288411201
TEST=CQ+1

Change-Id: I310bc3d0871ab4c2c157be94544f3dd949e1c8a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/libevdev/+/4708107
Tested-by: George Burgess <[email protected]>
Reviewed-by: Sean O'Brien <[email protected]>
Commit-Queue: George Burgess <[email protected]>
1 file changed