Fix Linux compilation.

src/platform/linux/mod.rs

@@ -340,7 +340,7 @@ impl Pal for Sys {
     }
 
     fn getrusage(who: c_int, r_usage: &mut rusage) -> c_int {
-        e(unsafe { syscall!(GETRUSAGE, who, r_usage) }) as c_int
+        e(unsafe { syscall!(GETRUSAGE, who, r_usage as *mut rusage) }) as c_int
     }
 
     fn getsid(pid: pid_t) -> pid_t {

src/platform/linux/signal.rs

@@ -100,7 +100,7 @@ impl PalSignal for Sys {
     }
 
     fn sigsuspend(set: &sigset_t) -> c_int {
-        e(syscall!(RT_SIGSUSPEND, set, NSIG / 8)) as c_int
+        unsafe { e(syscall!(RT_SIGSUSPEND, set as *const sigset_t, NSIG / 8)) as c_int }
     }
 
     unsafe fn sigtimedwait(