Revert "Fix engine include errors on Fedora Rawhide"

This reverts commit 1d57ccf94a.

.github/workflows/fedora-rawhide.yml

@@ -25,7 +25,7 @@ jobs:
         submodules: true
     - name: Install dependencies
       run: |
-        dnf -y install git cmake ncurses-devel openssl-devel-engine libsodium-devel readline-devel zlib-devel gcc-c++ clang
+        dnf -y install git cmake ncurses-devel openssl-devel libsodium-devel readline-devel zlib-devel gcc-c++ clang
     - name: Compile with ${{ matrix.cc }}
       run: |
         export CC=${{ matrix.cc }}

src/Mayaqua/Encrypt.c

@@ -20,9 +20,7 @@
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
-#ifndef OPENSSL_NO_ENGINE
 #include <openssl/engine.h>
-#endif
 #include <openssl/bio.h>
 #include <openssl/x509.h>
 #include <openssl/pkcs7.h>
@@ -42,6 +40,10 @@
 #include <openssl/x509v3.h>
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
 #include <openssl/provider.h>
+// Static oqsprovider initialization function
+#ifndef SKIP_OQS_PROVIDER
+	extern OSSL_provider_init_fn oqs_provider_init;
+#endif
 #endif
 
 #ifdef _MSC_VER
@@ -4005,7 +4007,13 @@ void InitCryptLibrary()
 #if OPENSSL_VERSION_NUMBER >= 0x30000000L
 	ossl_provider_default = OSSL_PROVIDER_load(NULL, "legacy");
 	ossl_provider_legacy = OSSL_PROVIDER_load(NULL, "default");
-	ossl_provider_oqsprovider = OSSL_PROVIDER_load(NULL, "oqsprovider");
+
+	char *oqs_provider_name = "oqsprovider";
+	#ifndef SKIP_OQS_PROVIDER
+		// Registers "oqsprovider" as a provider -- necessary because oqsprovider is built in now.
+		OSSL_PROVIDER_add_builtin(NULL, oqs_provider_name, oqs_provider_init); 
+	#endif
+	ossl_provider_oqsprovider = OSSL_PROVIDER_load(NULL, oqs_provider_name);
 #endif
 
 	ssl_clientcert_index = SSL_get_ex_new_index(0, "struct SslClientCertInfo *", NULL, NULL, NULL);