Windows cross-compile cleanup

It should be sufficient to just try to see if socklen_t is defined.
Next, on all platforms it would be int in all other platforms.
And, there is no need to check for the type in monolitic environment
like Windows, as it will be always the same.

Currently it fails cross compile windows in mingw-w64 compiler, as
winsock.h is as follows:
   """
     /* define WINSOCK_API_LINKAGE and WSAAPI for less
      * diff output between winsock.h and winsock2.h, but
      * remember to undefine them at the end of file */
   """
And the macro uses these macros which are internal winsock macros and
should not be used anyway.

Also, when did the autodefs.h went mandatory? Why is it in
tap-win32/common.h while no constant is actually used?

The use of WSA_IO_INCOMPLETE without including winsock2.h is invalid!
Look at http://msdn.microsoft.com/en-us/library/aa921087.aspx

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: James Yonan <james@openvpn.net>
Signed-off-by: David Sommerseth <davids@redhat.com>

acinclude.m4

@@ -90,34 +90,30 @@ AC_DEFUN([TYPE_SOCKLEN_T],
       AC_MSG_CHECKING([for socklen_t equivalent])
       AC_CACHE_VAL([curl_cv_socklen_t_equiv],
       [
-         # Systems have either "struct sockaddr *" or
-         # "void *" as the second argument to getpeername
-         curl_cv_socklen_t_equiv=
-         for arg2 in "struct sockaddr" void; do
-            for t in int size_t unsigned long "unsigned long"; do
-               AC_TRY_COMPILE([
-                  #ifdef _WIN32
-                  #include <windows.h>
-                  #define PREFIX1 WINSOCK_API_LINKAGE
-                  #define PREFIX2 PASCAL
-                  #else
-                  #include <sys/types.h>
-                  #include <sys/socket.h>
-                  #define PREFIX1
-                  #define PREFIX2
-                  #define SOCKET int
-                  #endif
+         case "$host" in
+	 *-mingw*) curl_cv_socklen_t_equiv=int ;;
+	 *)
+            # Systems have either "struct sockaddr *" or
+            # "void *" as the second argument to getpeername
+            curl_cv_socklen_t_equiv=
+            for arg2 in "struct sockaddr" void; do
+               for t in int size_t unsigned long "unsigned long"; do
+                  AC_TRY_COMPILE([
+                     #include <sys/types.h>
+                     #include <sys/socket.h>
 
-                  PREFIX1 int PREFIX2 getpeername (SOCKET, $arg2 *, $t *);
-               ],[
-                  $t len;
-                  getpeername(0,0,&len);
-               ],[
-                  curl_cv_socklen_t_equiv="$t"
-                  break
-               ])
+                     int getpeername (int, $arg2 *, $t *);
+                  ],[
+                     $t len;
+                     getpeername(0,0,&len);
+                  ],[
+                     curl_cv_socklen_t_equiv="$t"
+                     break
+                  ])
+               done
             done
-         done
+	 ;;
+	 esac
 
          if test "x$curl_cv_socklen_t_equiv" = x; then
             AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])

configure.ac

@@ -320,6 +320,7 @@ case "$host" in
 	;;
 *-mingw*)
 	AC_DEFINE(TARGET_WIN32, 1, [Are we running WIN32?])
+	CPPFLAGS="${CPPFLAGS} -DWIN32_LEAN_AND_MEAN"
 	OPENVPN_ADD_LIBS(-lgdi32)
 	OPENVPN_ADD_LIBS(-lws2_32)
 	OPENVPN_ADD_LIBS(-lwininet)

syshead.h

@@ -47,6 +47,7 @@
 
 #ifdef WIN32
 #include <windows.h>
+#include <winsock2.h>
 #define sleep(x) Sleep((x)*1000)
 #define random rand
 #define srandom srand

tap-win32/common.h

@@ -28,7 +28,9 @@
 // common to both.
 //===============================================
 
+#ifndef HAVE_CONFIG_H
 #include "autodefs.h"
+#endif
 
 //=============
 // TAP IOCTLs