Create crate and stubs for wctype

Create the wctype crate and stub functions with the unimplemented macro.

src/platform/src/types.rs

@@ -44,6 +44,7 @@ pub type c_ulong = u64;
 
 pub type wchar_t = i16;
 pub type wint_t = i32;
+pub type wctype_t = i64;
 
 pub type off_t = c_long;
 pub type mode_t = u16;