Fix O_CLOEXEC for DragonFly

Author: mneumann

src/unix/bsd/freebsdlike/dragonfly/mod.rs

@@ -64,3 +64,4 @@ pub const PTHREAD_STACK_MIN: ::size_t = 1024;
 pub const KERN_PROC_PATHNAME: ::c_int = 9;
 pub const SIGSTKSZ: ::size_t = 40960;
 pub const MADV_INVAL: ::c_int = 10;
+pub const O_CLOEXEC: ::c_int = 0x00020000;

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -49,6 +49,7 @@ pub const SIGSTKSZ: ::size_t = 34816;
 pub const SF_NODISKIO: ::c_int = 0x00000001;
 pub const SF_MNOWAIT: ::c_int = 0x00000002;
 pub const SF_SYNC: ::c_int = 0x00000004;
+pub const O_CLOEXEC: ::c_int = 0x00100000;
 
 extern {
     pub fn __error() -> *mut ::c_int;

src/unix/bsd/freebsdlike/mod.rs

@@ -147,7 +147,6 @@ pub const O_CREAT: ::c_int = 512;
 pub const O_EXCL: ::c_int = 2048;
 pub const O_NOCTTY: ::c_int = 32768;
 pub const O_TRUNC: ::c_int = 1024;
-pub const O_CLOEXEC: ::c_int = 0x00100000;
 pub const S_IFIFO: mode_t = 4096;
 pub const S_IFCHR: mode_t = 8192;
 pub const S_IFBLK: mode_t = 24576;