Define EC name constants for openssl3

Signed-off-by: Norbert Pocs <npocs@redhat.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/libcrypto-compat.h

@@ -2,6 +2,11 @@
 #define LIBCRYPTO_COMPAT_H
 
 #include <openssl/opensslv.h>
+
+#define NISTP256 "P-256"
+#define NISTP384 "P-384"
+#define NISTP521 "P-521"
+
 #if OPENSSL_VERSION_NUMBER < 0x10100000L
 
 #include <openssl/rsa.h>