Trusty: Build boringssl with C++ support

We now have an STL available for boringssl, so we can build with C++
support which is needed for ACVP testing. Remove the define suppressing
C++ APIs.

Test: build.py qemu-generic-arm64-test-debug
Change-Id: Ibc5cc5fe3a8461b8f73ad32e96112bd8577c1840
1 file changed