Make binary compatibility not the default

binding.gyp

include/grpc/impl/codegen/port_platform.h

setup.py

src/core/support/env_linux.c

src/core/support/time_posix.c

src/python/grpcio/grpc/_cython/imports.generated.c

src/python/grpcio/grpc/_cython/imports.generated.h

src/ruby/ext/grpc/extconf.rb

templates/binding.gyp.template

tools/run_tests/artifact_targets.py