linux musl bring ucontext api for related archs

Author: devnexen

src/unix/linux_like/linux/musl/b64/aarch64/mod.rs

@@ -682,6 +682,10 @@ pub const TIOCM_RI: ::c_int = TIOCM_RNG;
 
 extern "C" {
     pub fn ioctl(fd: ::c_int, request: ::c_int, ...) -> ::c_int;
+    pub fn getcontext(ucp: *mut ucontext_t) -> ::c_int;
+    pub fn setcontext(ucp: *const ucontext_t) -> ::c_int;
+    pub fn makecontext(ucp: *mut ucontext_t, func: extern "C" fn(), argc: ::c_int, ...);
+    pub fn swapcontext(uocp: *mut ucontext_t, ucp: *const ucontext_t) -> ::c_int;
 }
 
 cfg_if! {

src/unix/linux_like/linux/musl/b64/x86_64/mod.rs

@@ -950,6 +950,10 @@ pub const TIOCM_RI: ::c_int = TIOCM_RNG;
 
 extern "C" {
     pub fn ioctl(fd: ::c_int, request: ::c_int, ...) -> ::c_int;
+    pub fn getcontext(ucp: *mut ucontext_t) -> ::c_int;
+    pub fn setcontext(ucp: *const ucontext_t) -> ::c_int;
+    pub fn makecontext(ucp: *mut ucontext_t, func: extern "C" fn(), argc: ::c_int, ...);
+    pub fn swapcontext(uocp: *mut ucontext_t, ucp: *const ucontext_t) -> ::c_int;
 }
 
 cfg_if! {