Bug chromium:691427

The official build uses the LLVM gold linker, which seems
to have an issue with some visibility settings. Restoring
these settings for now to solve the issue.

Change-Id: I4f448c38bb7c964b2a53d19e064ecb23c119ab61
Reviewed-on: https://swiftshader-review.googlesource.com/8770Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>