Add sys/select.h to sys/types.h

This was triggered by gcc for some reason It included sys/types.h and
assumed sys/select.h to be there. And that seams to be the case in musl.

The problem with relibc here is that sys/types.h is are part of relibc
"include/*.h" files, while sys/select.h is generated by cbindgen. That
makes it impossible to #include select.h in types.h epsecially that
there are files like fcntl.c that uses types.h. They would complain
about missing headers. I fixed this by renaming sys/types.h to
sys/types_internal.h and then generating types.h using cbindgen as well
except for that. however fcntl and dlmalloc can include types_internal
instead of types.h

src/header/mod.rs

@@ -51,6 +51,7 @@ pub mod arch_aarch64_user;
 pub mod arch_x64_user;
 pub mod sys_procfs;
 pub mod sys_random;
+pub mod sys_types;
 pub mod sys_uio;
 pub mod sys_un;
 pub mod sys_utsname;

src/header/sys_types/cbindgen.toml

@@ -0,0 +1,7 @@
+sys_includes = ["stddef.h", "sys/types_internal.h", "sys/select.h"]
+include_guard = "_SYS_TYPES_H"
+language = "C"
+style = "Tag"
+
+[enum]
+prefix_with_name = true

src/header/sys_types/mod.rs

@@ -0,0 +1,2 @@
+//! sys/types.h
+use crate::platform::types::*;