c2rust transpile: Allow any integral types in init lists, not just …

…`char` and `int` (#1076)

* Fixes #1009.

This also fixes these errors in transpiling
[`nasa/cFS`](https://github.com/nasa/cFS).

c2rust-transpile/src/translator/literals.rs

@@ -249,7 +249,7 @@ impl<'c> Translation<'c> {
             CTypeKind::Vector(CQualTypeId { ctype, .. }, len) => {
                 self.vector_list_initializer(ctx, ids, ctype, len)
             }
-            CTypeKind::Char | CTypeKind::Int => {
+            ref kind if kind.is_integral_type() => {
                 let id = ids.first().unwrap();
                 self.convert_expr(ctx.used(), *id)
             }