Add SEEK_DATA and SEEK_HOLE constants to FreeBSD and DragonFlyBSD
@@ -264,6 +264,8 @@ pub const EOF: ::c_int = -1;
pub const SEEK_SET: ::c_int = 0;
pub const SEEK_CUR: ::c_int = 1;
pub const SEEK_END: ::c_int = 2;
+pub const SEEK_DATA: ::c_int = 3;
+pub const SEEK_HOLE: ::c_int = 4;
pub const _IOFBF: ::c_int = 0;
pub const _IONBF: ::c_int = 2;
pub const _IOLBF: ::c_int = 1;
