Auto merge of #2298 - devnexen:netbsd_login_api, r=JohnTitor

netbsd login api addition

Author: bors

libc-test/semver/netbsd.txt

@@ -1155,6 +1155,9 @@ lchflags
 lio_listio
 localeconv_l
 lockf
+login
+logout
+logwtmp
 login_tty
 lutimes
 lwpid_t

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

@@ -2294,6 +2294,10 @@ extern "C" {
         denominator: ::intmax_t,
         precision: ::size_t,
     ) -> *mut ::c_char;
+    #[link_name = "__login50"]
+    pub fn login(ut: *const utmp);
+    pub fn logout(line: *const ::c_char);
+    pub fn logwtmp(line: *const ::c_char, name: *const ::c_char, host: *const ::c_char);
 }
 
 cfg_if! {