adding waitid call to netbsd

close #2243

Author: devnexen

libc-test/semver/netbsd.txt

@@ -1290,3 +1290,4 @@ utmpxname
 utpname
 vm_size_t
 wait4
+waitid

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -2081,6 +2081,13 @@ extern "C" {
         timeout: *const ::timespec,
     ) -> ::c_int;
     pub fn sigwaitinfo(set: *const sigset_t, info: *mut siginfo_t) -> ::c_int;
+    pub fn waitid(
+        idtype: idtype_t,
+        id: ::id_t,
+        infop: *mut ::siginfo_t,
+        options: ::c_int,
+    ) -> ::c_int;
+
     pub fn duplocale(base: ::locale_t) -> ::locale_t;
     pub fn freelocale(loc: ::locale_t);
     pub fn localeconv_l(loc: ::locale_t) -> *mut lconv;