fix: enabled fuzzing

fuzz/fuzz_targets/mceliece_encaps.rs

@@ -0,0 +1,14 @@
+#![no_main]
+extern crate rosenpass;
+
+use libfuzzer_sys::fuzz_target;
+
+use rosenpass::pqkem::{StaticKEM, KEM};
+
+fuzz_target!(|input: &[u8]| {
+    let mut ciphertext = [0u8; 188];
+    let mut shared_secret = [0u8; 32];
+
+    // We expect errors while fuzzing therefore we do not check the result.
+    let _ = StaticKEM::encaps(&mut shared_secret, &mut ciphertext, input);
+});