iphlpapi: Don't rely on the HAVE_XXX macros having a numeric values.

dlls/iphlpapi/ipstats.c

@@ -664,9 +664,9 @@ DWORD WINAPI GetIpStatistics(PMIB_IPSTATS stats)
         int mib[] = {CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS};
 #define MIB_LEN (sizeof(mib) / sizeof(mib[0]))
         int ip_ttl, ip_forwarding;
-#if HAVE_STRUCT_IPSTAT_IPS_TOTAL
+#if defined(HAVE_STRUCT_IPSTAT_IPS_TOTAL)
         struct ipstat ip_stat;
-#elif HAVE_STRUCT_IP_STATS_IPS_TOTAL
+#elif defined(HAVE_STRUCT_IP_STATS_IPS_TOTAL)
         struct ip_stats ip_stat;
 #endif
         size_t needed;
@@ -812,7 +812,7 @@ DWORD WINAPI GetTcpStatistics(PMIB_TCPSTATS stats)
         }
         if (kc) kstat_close( kc );
     }
-#elif defined(HAVE_SYS_SYSCTL_H) && defined(TCPCTL_STATS) && (HAVE_STRUCT_TCPSTAT_TCPS_CONNATTEMPT || HAVE_STRUCT_TCP_STATS_TCPS_CONNATTEMPT)
+#elif defined(HAVE_SYS_SYSCTL_H) && defined(TCPCTL_STATS) && (defined(HAVE_STRUCT_TCPSTAT_TCPS_CONNATTEMPT) || defined(HAVE_STRUCT_TCP_STATS_TCPS_CONNATTEMPT))
     {
 #ifndef TCPTV_MIN  /* got removed in Mac OS X for some reason */
 #define TCPTV_MIN 2
@@ -821,9 +821,9 @@ DWORD WINAPI GetTcpStatistics(PMIB_TCPSTATS stats)
         int mib[] = {CTL_NET, PF_INET, IPPROTO_TCP, TCPCTL_STATS};
 #define MIB_LEN (sizeof(mib) / sizeof(mib[0]))
 #define hz 1000
-#if HAVE_STRUCT_TCPSTAT_TCPS_CONNATTEMPT
+#if defined(HAVE_STRUCT_TCPSTAT_TCPS_CONNATTEMPT)
         struct tcpstat tcp_stat;
-#elif HAVE_STRUCT_TCP_STATS_TCPS_CONNATTEMPT
+#elif defined(HAVE_STRUCT_TCP_STATS_TCPS_CONNATTEMPT)
         struct tcp_stats tcp_stat;
 #endif
         size_t needed = sizeof(tcp_stat);