[Minor] Convert some enums to static macros

contrib/librdns/rdns.h

 
 struct rdns_reply_entry {
 	union rdns_reply_element_un content;
-	uint16_t type;
+	enum rdns_request_type type;
 	int32_t ttl;
 	struct rdns_reply_entry *prev, *next;
 };

src/libcryptobox/blake2/blake2.h

 extern "C" {
 #endif
 
-enum blake2b_constant {
-	BLAKE2B_BLOCKBYTES = 128,
-	BLAKE2B_OUTBYTES = 64,
-	BLAKE2B_KEYBYTES = 64,
-	BLAKE2B_SALTBYTES = 16,
-	BLAKE2B_PERSONALBYTES = 16
-};
+
+#define BLAKE2B_BLOCKBYTES 128
+#define BLAKE2B_OUTBYTES 64
+#define BLAKE2B_KEYBYTES 64
+#define BLAKE2B_SALTBYTES 16
+#define BLAKE2B_PERSONALBYTES 16
+
 
 typedef struct blake2b_state_t {
 	unsigned char opaque[256];

src/libcryptobox/chacha20/chacha.h

 #ifndef CHACHA_H_
 #define CHACHA_H_
 
-enum chacha_constants {
-	CHACHA_BLOCKBYTES = 64,
-};
+
+#define CHACHA_BLOCKBYTES 64
 
 typedef struct chacha_state_internal_t {
 	unsigned char s[48];

src/libcryptobox/poly1305/ref-64.c

 #include "config.h"
 #include "poly1305.h"
 #include "poly1305_internal.h"
-enum {
-	POLY1305_BLOCK_SIZE = 16
-};
+
+#define POLY1305_BLOCK_SIZE 16
 
 typedef struct poly1305_state_ref_t {
 	uint64_t r[3];

src/libutil/addr.c

 		}
 	}
 
-	if (type != SOCK_DGRAM) {
+	if (type != (int)SOCK_DGRAM) {
 
 		if (addr->af == AF_UNIX) {
 			path = addr->u.un->addr.sun_path;