[illumos] add some recently-added constants

Constants added from [this commit].

[this commit]: illumos/illumos-gate@0250c53

Author: sunshowers

libc-test/semver/illumos.txt

@@ -1,3 +1,9 @@
+F_DUPFD_CLOFORK
+F_DUP2FD_CLOEXEC
+F_DUP2FD_CLOFORK
+F_DUP3FD
+FD_CLOFORK
+O_CLOFORK
 O_RSYNC
 POLLRDHUP
 POSIX_FADV_DONTNEED

src/unix/solarish/illumos.rs

@@ -45,7 +45,12 @@ pub const F_FLOCK: ::c_int = 53;
 pub const F_FLOCKW: ::c_int = 54;
 
 pub const F_DUPFD_CLOEXEC: ::c_int = 37;
+pub const F_DUPFD_CLOFORK: ::c_int = 58;
 pub const F_DUP2FD_CLOEXEC: ::c_int = 36;
+pub const F_DUP2FD_CLOFORK: ::c_int = 57;
+pub const F_DUP3FD: ::c_int = 59;
+
+pub const FD_CLOFORK: ::c_int = 2;
 
 pub const FIL_ATTACH: ::c_int = 0x1;
 pub const FIL_DETACH: ::c_int = 0x2;
@@ -56,8 +61,13 @@ pub const FILF_AUTO: ::c_int = 0x2;
 pub const FILF_BYPASS: ::c_int = 0x4;
 pub const SOL_FILTER: ::c_int = 0xfffc;
 
+pub const O_CLOFORK: ::c_int = 0x4000000;
+
 pub const MADV_PURGE: ::c_int = 9;
 
+pub const MSG_CMSG_CLOEXEC: ::c_int = 0x1000;
+pub const MSG_CMSG_CLOFORK: ::c_int = 0x2000;
+
 pub const POSIX_FADV_NORMAL: ::c_int = 0;
 pub const POSIX_FADV_RANDOM: ::c_int = 1;
 pub const POSIX_FADV_SEQUENTIAL: ::c_int = 2;