use named pipe when creating new jobserver

[NobodyXu]

Ref: rust-lang/cargo#13483 rust-lang/cc-rs#962

[NobodyXu]

I propose that we should create named fifo instead of annoymous pipe by default, while retaining compatibility with older make by still passing the fds like this MAKEFLAGS='--jobserver-auth=fifo:/path/to/fifo --jobserver-fds=3,5'.

[NobodyXu]

Unfortunately, --jobserver-auth is introduced in 4.2, but fifo jobserver and --jobserver-style is introduced in make 4.4

This means that if we use fifo we would break backwards compatibility, so closing this for now.