Use a Vec for the Monero generators, preventing its massive stack usage

The amount of stack usage did cause issues on m1 computers.

coins/monero/build.rs

@@ -44,10 +44,10 @@ fn generators(prefix: &'static str, path: &str) {
           pub(crate) static GENERATORS_CELL: OnceLock<Generators> = OnceLock::new();
           pub fn GENERATORS() -> &'static Generators {{
             GENERATORS_CELL.get_or_init(|| Generators {{
-              G: [
+              G: vec![
                 {G_str}
               ],
-              H: [
+              H: vec![
                 {H_str}
               ],
             }})