transpile: Init list not implemented for Uint

[spernsteiner]

int f() {
    unsigned x = { 1 };
    return x;
}

int g() {
    int x = { 1 };
    return x;
}

Translation of g succeeds. Translation of f fails, complaining "Init list not implemented for Uint", and f is omitted from the generated Rust code.

[kkysen]

I think the fix to support any scalar type should be pretty trivial.