Auto merge of #45725 - alexcrichton:std-less-rand, r=dtolnay

Working towards a libc-less (wasm32) libstd

This is a series of commits I was able to extract from prepare to comiple libstd on a "bare libc-less" target, notably wasm32. The actual wasm32 bits I intend to send in a PR later, this is just some internal refactorings required for libstd to work with a `libc` that's empty and a few other assorted refactorings.

No functional change should be included in this PR for users of libstd, this is intended to just be internal refactorings.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/libstd/sys_common/thread.rs b/src/libstd/sys_common/thread.rs
index 87fb34a9dec..c19424f2952 100644
--- a/src/libstd/sys_common/thread.rs
+++ b/src/libstd/sys_common/thread.rs
@@ -10,12 +10,11 @@
 
 use env;
 use alloc::boxed::FnBox;
-use libc;
 use sync::atomic::{self, Ordering};
 use sys::stack_overflow;
 use sys::thread as imp;
 
-pub unsafe fn start_thread(main: *mut libc::c_void) {
+pub unsafe fn start_thread(main: *mut u8) {
     // Next, set up our stack overflow handler which may get triggered if we run
     // out of stack.
     let _handler = stack_overflow::Handler::new();