src: use named struct instead of typedef

PR-URL: #43881
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

src/crypto/crypto_groups.h

@@ -390,12 +390,12 @@ static const unsigned char group_modp18[] = {
   0x80, 0xdd, 0x98, 0xed, 0xd3, 0xdf, 0xff, 0xff, 0xff, 0xff,
   0xff, 0xff, 0xff, 0xff };
 
-typedef struct {
+struct modp_group {
   const char* name;
   const char* prime;
   unsigned int prime_size;
   unsigned int gen;
-} modp_group;
+};
 
 static const modp_group modp_groups[] = {
 #define V(var) reinterpret_cast<const char*>(var)