Auto merge of #2164 - devnexen:obsd_update, r=Amanieu

openbsd adding mmap MAP_CONCEAL flag.

Author: bors

libc-test/semver/openbsd.txt

@@ -418,6 +418,7 @@ MADV_NORMAL
 MADV_RANDOM
 MADV_SEQUENTIAL
 MADV_WILLNEED
+MAP_CONCEAL
 MAP_COPY
 MAP_FILE
 MAP_HASSEMAPHORE

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

@@ -1360,6 +1360,7 @@ pub const NTFS_MFLAG_ALLNAMES: ::c_int = 0x2;
 pub const TMPFS_ARGS_VERSION: ::c_int = 1;
 
 pub const MAP_STACK: ::c_int = 0x4000;
+pub const MAP_CONCEAL: ::c_int = 0x8000;
 
 // https://github.com/openbsd/src/blob/master/sys/net/if.h#L187
 pub const IFF_UP: ::c_int = 0x1; // interface is up