[improper_ctypes] Stop complaining about repr(usize) and repr(isize) enums

This dates back to at least #26583. At the time, usize and isize were considered ffi-unsafe to nudge people away from them, but this changed in the aforementioned PR, making it inconsistent to complain about it in enum discriminants. In fact, repr(usize) is probably the best way to interface with `enum Foo : size_t { ... }`.

src/test/compile-fail/lint-ctypes-enum.rs

@@ -16,11 +16,23 @@ enum U { A }
 enum B { C, D }
 enum T { E, F, G }
 
+#[repr(C)]
+enum ReprC { A, B, C }
+
+#[repr(u8)]
+enum U8 { A, B, C }
+
+#[repr(isize)]
+enum Isize { A, B, C }
+
 extern {
    fn zf(x: Z);
    fn uf(x: U); //~ ERROR found enum without foreign-function-safe
    fn bf(x: B); //~ ERROR found enum without foreign-function-safe
    fn tf(x: T); //~ ERROR found enum without foreign-function-safe
+   fn reprc(x: ReprC);
+   fn u8(x: U8);
+   fn isize(x: Isize);
 }
 
 pub fn main() { }