proc_macro_api: make commit & date suffix of binary version optional
proc_macro_api: make commit & date suffix of binary version optional

Signed-off-by: Florian "sp1rit"​ <7c917e86b8d984ae59ec6f96b99394e39f32f189@protonmail.com>

rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer,rust-analyzer/rust-analyzer