configure: Check for getaddrinfo in ws2tcpip.h, too

This function is only available in the headers if unconditionally
targeting a version >= XP. It is not strictly necessary, since we
try loading these functions dynamically at runtime on windows in
the fallback, but this makes things a bit faster and more
straightforward.

On mingw32, this function isn't visible by default, while it is
on mingw64 (on both 32 and 64 bit).
Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -2863,7 +2863,8 @@ check_func nanosleep || { check_func nanosleep -lrt && add_extralibs -lrt; }
 
 check_func  fcntl
 check_func  fork
-check_func  getaddrinfo $network_extralibs
+check_func  getaddrinfo $network_extralibs ||
+    check_func_headers ws2tcpip.h getaddrinfo $network_extralibs
 check_func  gethrtime
 check_func  getopt
 check_func  getrusage