Fix W2k 'freeaddrinfo' error

Trying to run the pthread enabled binaries on W2k resulted in an error
dialog with the text, "The procedure entry point freeaddrinfo could not be
located in ws2_32.dll".  A Microsoft support page
(http://support.microsoft.com/kb/955045) hints that when 'ws2tcpip.h' is
included that 'wspiapi.h' should be included as well.  Since MinGw
includes both files, this patch corrects the runtime error on W2k

configure.ac

@@ -116,8 +116,9 @@ dnl set host_os variable
 AC_CANONICAL_HOST
 
 dnl ws2tcpip.h not provided by cygwin and its test causes a configure warning.
+dnl wspiapi.h provides needed freeaddrinfo function on W2k systems.
 AS_IF([test "${host_os}" != "cygwin"], [
-       AC_CHECK_HEADERS([ws2tcpip.h])
+       AC_CHECK_HEADERS([ws2tcpip.h wspiapi.h])
 ])
 
 

lib/getaddrinfo.c

@@ -48,6 +48,9 @@
 #include <sys/socket.h>
 #elif HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
+#	if defined(HAVE_WSPIAPI_H)
+#		include <wspiapi.h>
+#	endif
 #endif
 
 /*

src/network.c

@@ -59,6 +59,9 @@
 #include <sys/socket.h>
 #elif HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
+#	if defined(HAVE_WSPIAPI_H)
+#		include <wspiapi.h>
+#	endif
 #endif
 
 #include "hamlib/rig.h"

tests/rigctld.c

@@ -49,6 +49,9 @@
 #elif HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #include <fcntl.h>
+#	if defined(HAVE_WSPIAPI_H)
+#		include <wspiapi.h>
+#	endif
 #endif
 #ifdef HAVE_NETDB_H
 #include <netdb.h>

tests/rotctld.c

@@ -48,6 +48,9 @@
 #elif HAVE_WS2TCPIP_H
 #include <ws2tcpip.h>
 #include <fcntl.h>
+#	if defined(HAVE_WSPIAPI_H)
+#		include <wspiapi.h>
+#	endif
 #endif
 #ifdef HAVE_NETDB_H
 #include <netdb.h>