building @grpc/grpc-js without alpn support

### Is your feature request related to a problem? Please describe.
I would like to use @grpc/grpc-js library with servers that do not support alpn configuration.
### Describe the solution you'd like
Something analogous to `npm install grpc@1.24.2 --global --build-from-source --grpc_alpn=false` would be very helpful.

### Describe alternatives you've considered
The usual install of @grpc/grpc-js or
`npm install @grpc/grpc-js --global --build-from-source --grpc_alpn=false` does not work.

### Additional context
I encounter this error when I try to communicate with the server: Error: 14 UNAVAILABLE: failed to connect to all addresses.

node10.18.1, macOS Catalina