Fix Proto compilation on M1 Macs

The Maven artifact upstream doesn't have an ARM version of Proto
compiler. Since updating the artifact breaks the compilation, this
explicitly requests x86 protoc binary which is then run via Rosetta.
Build completes successfully.

Change-Id: Ia13f28a6f019ad53e88f6dd4a8788ab7ec1ebead
Test: Manual
1 file changed