Auto merge of #2439 - devnexen:fparseln_fbsd, r=Amanieu

fparseln for freebsd/dragonfly.

Author: bors

libc-test/semver/dragonfly.txt

@@ -1229,6 +1229,7 @@ fchflags
 fdopendir
 fmemopen
 forkpty
+fparseln
 freeifaddrs
 freelocale
 freezero

libc-test/semver/freebsd.txt

@@ -1453,6 +1453,7 @@ flsl
 flsll
 fmemopen
 forkpty
+fparseln
 freeifaddrs
 freelocale
 fsid_t

src/unix/bsd/freebsdlike/mod.rs

@@ -1727,6 +1727,13 @@ extern "C" {
         winp: *mut ::winsize,
     ) -> ::pid_t;
     pub fn login_tty(fd: ::c_int) -> ::c_int;
+    pub fn fparseln(
+        stream: *mut ::FILE,
+        len: *mut ::size_t,
+        lineno: *mut ::size_t,
+        delim: *const ::c_char,
+        flags: ::c_int,
+    ) -> *mut ::c_char;
 }
 
 #[link(name = "execinfo")]