Fix clang build.

Apparently clang really doesn't want you to take the address of a builtin.
Since this is only a temporary hack, let's just shrug and accept that
clang-built volantis images won't work until we have new NVIDIA blobs.

Bug: http://b/20065774
Change-Id: I4c8e893b15a1af8f9c54d3f89bfef112b63d09b4