Assign compile_multilib for executable snapshots

Some executable binaries have both 32-bit and 64-bit outputs, and
sometimes both variants are needed to be installed. One good example is
boringssl_self_test. This CL assigns compile_multilib to support such
cases.

Bug: 157106227
Test: install vendor snapshot
Change-Id: I016265e7234a59ac480c47a1df2035f4ef7ed89f
1 file changed