split out stdio constants for fcntl header

src/header/stdio/cbindgen.toml

@@ -3,6 +3,7 @@ sys_includes = ["stdarg.h", "stddef.h", "stdint.h", "features.h"]
 after_includes = """
 #include <bits/off-t.h>   // for off_t from sys/types.h
 #include <bits/ssize-t.h> // for ssize_t from sys/types.h
+#include <bits/fcntl.h>   // for SEEK_CUR, SEEK_END and SEEK_SET
 """
 include_guard = "_RELIBC_STDIO_H"
 trailer = """

src/header/stdio/constants.rs

@@ -16,9 +16,7 @@ pub const F_SVB: c_int = 64;
 pub const F_APP: c_int = 128;
 pub const F_BADJ: c_int = 256;
 
-pub const SEEK_SET: c_int = 0;
-pub const SEEK_CUR: c_int = 1;
-pub const SEEK_END: c_int = 2;
+/// SEEK_SET, SEEK_CUR and SEEK_END defined in fcntl bits header
 
 pub const _IOFBF: c_int = 0;
 pub const _IOLBF: c_int = 1;

src/header/stdio/mod.rs

@@ -39,6 +39,7 @@ use crate::{
 use reader::Reader;
 
 pub use self::constants::*;
+pub use crate::header::bits_fcntl::{SEEK_CUR, SEEK_END, SEEK_SET};
 mod constants;
 
 pub use self::default::*;