Weird cfgs in VxWorks module

[newpavlov]

VxWorks module contains weird, always false cfgs, which look like a copypaste leftovers:

libc/src/vxworks/mod.rs

Lines 966 to 970 in d7907c0

	#[cfg_attr(
	all(target_os = "macos", target_arch = "x86"),
	link_name = "fopen$UNIX2003"
	)]
	pub fn fopen(filename: *const c_char, mode: *const c_char) -> *mut FILE;

[BaoshanPang]

@newpavlov

Thanks for pointing it out, I will work on it.

[newpavlov]

Fixed in #1473