Use `syscall` from `libc` instead of defining a copy of it.

[eddyb]

Looks like the version of libc rand depends on has syscall, with the same signature, even, as:

rand/src/rngs/os.rs

Lines 421 to 423 in e2770c3

	extern "C" {
	fn syscall(number: libc::c_long, ...) -> libc::c_long;
	}

[nagisa]

One the great reasons to not depend on libc for a single function is build time.

…

On Sat, Sep 15, 2018, 09:51 Eduard-Mihai Burtescu ***@***.***> wrote: Looks like the version of libc rand depends on has syscall <https://docs.rs/libc/0.2.43/libc/fn.syscall.html>, with the same signature even. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#610>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AApc0mSwwliOzlzH0q3NffJZCXYVlvfyks5ubKNWgaJpZM4WqOyN> .

[vks]

Rand already depends on libc though.