move IPPORT_RESERVED from netdb.h to netinet/in.h

it's in the reserved namespace for the latter, where it seems it was
historically defined, and some programs expect to find it there.

include/netdb.h

@@ -24,8 +24,6 @@ struct addrinfo {
 	struct addrinfo *ai_next;
 };
 
-#define IPPORT_RESERVED 1024
-
 #define AI_PASSIVE      0x01
 #define AI_CANONNAME    0x02
 #define AI_NUMERICHOST  0x04

include/netinet/in.h

@@ -69,6 +69,8 @@ uint16_t htons(uint16_t);
 uint32_t ntohl(uint32_t);
 uint16_t ntohs(uint16_t);
 
+#define IPPORT_RESERVED 1024
+
 #define IPPROTO_IP       0
 #define IPPROTO_HOPOPTS  0
 #define IPPROTO_ICMP     1