Add LOCAL_PEERCRED and related to Dragonfly

https://gitweb.dragonflybsd.org/dragonfly.git/blob/cd4ac48fd186404370e0b8623530b6add4b70400:/sys/sys/ucred.h#l86

None of the other LOCAL_ constants for FreeBSD are available on Dragonfly:
https://gitweb.dragonflybsd.org/dragonfly.git/blob/master:/sys/sys/un.h

Author: tormol

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

@@ -89,14 +89,6 @@ s! {
         pub msg_ctime: ::time_t,
     }
 
-    pub struct xucred {
-        pub cr_version: ::c_uint,
-        pub cr_uid: ::uid_t,
-        pub cr_ngroups: ::c_short,
-        pub cr_groups: [::gid_t;16],
-        __cr_unused1: *mut ::c_void,
-    }
-
     pub struct stack_t {
         pub ss_sp: *mut ::c_void,
         pub ss_size: ::size_t,
@@ -629,7 +621,6 @@ pub const SO_PROTOCOL: ::c_int = 0x1016;
 pub const SO_PROTOTYPE: ::c_int = SO_PROTOCOL;
 pub const SO_VENDOR: ::c_int = 0x80000000;
 
-pub const LOCAL_PEERCRED: ::c_int = 1;
 pub const LOCAL_CREDS: ::c_int = 2;
 pub const LOCAL_CONNWAIT: ::c_int = 4;
 pub const LOCAL_VENDOR: ::c_int = SO_VENDOR;
@@ -1103,9 +1094,6 @@ pub const _PC_ACL_NFS4: ::c_int = 64;
 
 pub const _SC_CPUSET_SIZE: ::c_int = 122;
 
-pub const XU_NGROUPS: ::c_int = 16;
-pub const XUCRED_VERSION: ::c_uint = 0;
-
 // Flags which can be passed to pdfork(2)
 pub const PD_DAEMON: ::c_int = 0x00000001;
 pub const PD_CLOEXEC: ::c_int = 0x00000002;

src/unix/bsd/freebsdlike/mod.rs

@@ -219,6 +219,14 @@ s! {
         pub cmcred_groups: [::gid_t; CMGROUP_MAX],
     }
 
+    pub struct xucred {
+        pub cr_version: ::c_uint,
+        pub cr_uid: ::uid_t,
+        pub cr_ngroups: ::c_short,
+        pub cr_groups: [::gid_t; 16],
+        __cr_unused1: *mut ::c_void,
+    }
+
     pub struct rtprio {
         pub type_: ::c_ushort,
         pub prio: ::c_ushort,
@@ -947,6 +955,8 @@ pub const SO_RCVTIMEO: ::c_int = 0x1006;
 pub const SO_ERROR: ::c_int = 0x1007;
 pub const SO_TYPE: ::c_int = 0x1008;
 
+pub const LOCAL_PEERCRED: ::c_int = 1;
+
 pub const SHUT_RD: ::c_int = 0;
 pub const SHUT_WR: ::c_int = 1;
 pub const SHUT_RDWR: ::c_int = 2;
@@ -1133,6 +1143,9 @@ pub const ST_NOSUID: ::c_ulong = 2;
 
 pub const NI_MAXHOST: ::size_t = 1025;
 
+pub const XU_NGROUPS: ::c_int = 16;
+pub const XUCRED_VERSION: ::c_uint = 0;
+
 pub const RTLD_LOCAL: ::c_int = 0;
 pub const RTLD_NODELETE: ::c_int = 0x1000;
 pub const RTLD_NOLOAD: ::c_int = 0x2000;