Update to clang-4639204

Use clang-4639204 to build the keymaster unit tests.

Test: 'make' after setting up boringssl per instructions in 'Makefile'
Merged-In: I27bcfc46e9fb396d221b7242b0be79017d050ed5
Change-Id: I27bcfc46e9fb396d221b7242b0be79017d050ed5
1 file changed