t! macro can be replaced by '?' operator

[frewsxcv]

This file defines a t! macro, but it seems like we can remove that macro and just use the new ? unary operator instead.

rust/src/libstd/sys/unix/process/process_unix.rs

Lines 170 to 175 in 7ac0200

	macro_rules! t {
	($e:expr) => (match $e {
	Ok(e) => e,
	Err(e) => return e,
	})
	}

There might be other files with a t! macro defined.

[mati865]

#37939 probably should be fixed first