MDEV-27778 md5 in FIPS crashes with OpenSSL 3.0.0

OpenSSL 3.0.0+ does not support EVP_MD_CTX_FLAG_NON_FIPS_ALLOW any longer.
In OpenSSL 1.1.1 the non FIPS allowed flag is context specific, while
in 3.0.0+ it is a different EVP_MD provider.

Fixes #2010

part of MDEV-29000

mysys_ssl/my_md5.cc

@@ -52,12 +52,23 @@ static void md5_result(EVP_MD_CTX *context, uchar digest[MD5_HASH_SIZE])
 
 static void md5_init(EVP_MD_CTX *context)
 {
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+  EVP_MD *md5;
+  EVP_MD_CTX_init(context);
+  /* Ok to ignore FIPS: MD5 is not used for crypto here */
+  /* In OpenSSL 3.0.0+ it is a different EVP_MD provider */
+  md5 = EVP_MD_fetch(NULL, "MD5", "fips=no");
+  EVP_DigestInit_ex(context, md5, NULL);
+  EVP_MD_free(md5);
+#else
   EVP_MD_CTX_init(context);
 #ifdef EVP_MD_CTX_FLAG_NON_FIPS_ALLOW
   /* Ok to ignore FIPS: MD5 is not used for crypto here */
+  /* In OpenSSL 1.1.1 the non FIPS allowed flag is context specific */
   EVP_MD_CTX_set_flags(context, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 #endif
   EVP_DigestInit_ex(context, EVP_md5(), NULL);
+#endif
 }
 
 static void md5_input(EVP_MD_CTX *context, const uchar *buf, unsigned len)