Fix building unit tests with --enable-rpk --disable-rsa.

Exact configure line used:
 ./configure --enable-kyber --enable-mlkem --enable-dilithium --enable-dtls --enable-dtls13 --enable-dtls-frag-ch --enable-debug --enable-debug-trace-errcodes \
CFLAGS="-DHAVE_RPK -DWOLFSSL_DER_LOAD -DWOLFSSL_LOGGINGENABLED_DEFAULT=1" --disable-rsa

Author: kareem-wolfssl

tests/api.c

@@ -61443,7 +61443,7 @@ static int test_wolfSSL_DTLS_fragment_buckets(void)
 
 #if !defined(NO_FILESYSTEM) && \
      defined(WOLFSSL_DTLS) && !defined(WOLFSSL_NO_TLS12) && \
-     defined(HAVE_MANUAL_MEMIO_TESTS_DEPENDENCIES)
+     defined(HAVE_MANUAL_MEMIO_TESTS_DEPENDENCIES) && !defined(NO_RSA)
 
 static int test_wolfSSL_dtls_stateless2(void)
 {

tests/utils.h

@@ -27,7 +27,8 @@
 #ifndef TESTS_UTILS_H
 #define TESTS_UTILS_H
 
-#if !defined(NO_FILESYSTEM) && !defined(NO_CERTS) && !defined(NO_RSA) && \
+#if !defined(NO_FILESYSTEM) && !defined(NO_CERTS) && \
+    (!defined(NO_RSA) || defined(HAVE_RPK)) && \
     !defined(NO_WOLFSSL_SERVER) && !defined(NO_WOLFSSL_CLIENT) && \
     (!defined(WOLFSSL_NO_TLS12) || defined(WOLFSSL_TLS13))
 #define HAVE_MANUAL_MEMIO_TESTS_DEPENDENCIES