Do not use AI_ADDRCONFIG on Windows

It was not available on my MinGW crosscompiler,
and it may be harmful:
https://code.google.com/p/chromium/issues/detail?id=5234

Also, remove old conflicting WINVER in osflags.
It is set in src/windows.h now.

src/common.c

@@ -125,7 +125,12 @@ get_addr(char *host, int port, int addr_family, int flags, struct sockaddr_stora
 
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = addr_family;
+#ifdef WINDOWS32
+	/* AI_ADDRCONFIG misbehaves on windows */
+	hints.ai_flags = flags;
+#else
 	hints.ai_flags = AI_ADDRCONFIG | flags;
+#endif
 	hints.ai_socktype = SOCK_DGRAM;
 	hints.ai_protocol = IPPROTO_UDP;
 

src/osflags

@@ -26,9 +26,6 @@ link)
 	;;
 cflags)
 	case $1 in
-		windows32)
-			echo '-DWINVER=0x0501';
-		;;
 		BeOS)
 			echo '-Dsocklen_t=int';
 		;;