FIX: encoding test failure with partial kyber support

When either kyber or kyber_90s was disabled at build time we caused a test failure.

src/tests/test_kyber.cpp

@@ -204,6 +204,22 @@ class Kyber_Encoding_Test : public Text_Based_Test
  }
 
  public:
+ bool skip_this_test(const std::string &algo_name, const VarMap &) override
+ {
+ const auto mode = name_to_mode(algo_name);
+#if !defined(BOTAN_HAS_KYBER)
+ if(!mode.is_90s())
+ return true;
+#endif
+#if !defined(BOTAN_HAS_KYBER_90S)
+ if(mode.is_90s())
+ return true;
+#endif
+
+ BOTAN_UNUSED(algo_name, mode);
+ return false;
+ }
+
  Test::Result run_one_test(const std::string& algo_name, const VarMap& vars) override
  {
  Test::Result result("kyber_encodings");