move some constants from cbindgen to Rust in dirent

src/header/dirent/cbindgen.toml

@@ -6,17 +6,10 @@ sys_includes = ["sys/types.h"]
 include_guard = "_RELIBC_DIRENT_H"
 language = "C"
 style = "Both"
-trailer = """
+after_includes = """
+
 // Shamelessly stolen from musl
-#define DT_UNKNOWN 0
-#define DT_FIFO 1
-#define DT_CHR 2
-#define DT_DIR 4
-#define DT_BLK 6
-#define DT_REG 8
-#define DT_LNK 10
-#define DT_SOCK 12
-#define DT_WHT 14
+// Macros to convert between struct dirent and struct stat types.
 #define IFTODT(x) ((x)>>12 & 017)
 #define DTTOIF(x) ((x)<<12)
 """

src/header/dirent/mod.rs

@@ -24,6 +24,31 @@ use crate::{
     },
 };
 
+// values of below constants taken from musl
+
+/// Unknown file type.
+pub const DT_UNKNOWN: c_int = 0;
+/// FIFO special.
+pub const DT_FIFO: c_int = 1;
+/// Character special.
+pub const DT_CHR: c_int = 2;
+/// Directory.
+pub const DT_DIR: c_int = 4;
+/// Block special.
+pub const DT_BLK: c_int = 6;
+/// Regular.
+pub const DT_REG: c_int = 8;
+/// Symbolic link.
+pub const DT_LNK: c_int = 10;
+/// Socket.
+pub const DT_SOCK: c_int = 12;
+/// Non-POSIX.
+/// Whiteout inode.
+pub const DT_WHT: c_int = 14;
+
+// values of above constants taken from musl
+
+/// cbindgen:ignore
 const INITIAL_BUFSIZE: usize = 512;
 
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/dirent.h.html>.
@@ -163,6 +188,7 @@ pub struct posix_dent {
     pub d_name: [c_char; 256],
 }
 
+/// cbindgen:ignore
 #[cfg(target_os = "redox")]
 const _: () = {
     use core::mem::{offset_of, size_of};