android-interop has been failing to build since 46485c8 because it
didn't have cmake installed and defined LDFLAGS/CXXFLAGS with pkg-config
before make_dependencies.sh had been run.
Android-interop didn't verify the codegen is up-to-date. Building the
codegen was just a relic from when android was its own separate gradle
build. Avoiding codegen means we don't have to compile absl/protobuf and
have a C++ toolchain.
d124007ff4