os: enable UNIX sockets on Mingw32

Mingw32 also supports unix sockets, so no need to disable them here.

Since it's now always enabled, follow-up commits can now drop all the
extra #ifdef's on UNIXCONN and so reduce complexity.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

os/Xtranssock.c

@@ -73,12 +73,14 @@ from the copyright holders.
 #ifdef XTHREADS
 #include <X11/Xthreads.h>
 #endif
+#include <sys/stat.h>
 
 #include "os/ossock.h"
 
 #ifndef WIN32
 
 #if defined(UNIXCONN)
+#include <sys/un.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
@@ -90,12 +92,6 @@ from the copyright holders.
 #include <X11/Xos_r.h>
 #endif
 
-#ifdef UNIXCONN
-#include <sys/un.h>
-#include <sys/stat.h>
-#endif
-
-
 #ifndef NO_TCP_H
 #if defined(linux) || defined(__GLIBC__)
 #include <sys/param.h>
@@ -120,6 +116,8 @@ from the copyright holders.
 #include <X11/Xwindows.h>
 #include <X11/Xw32defs.h>
 
+#include <afunix.h>
+
 #undef EADDRINUSE
 #define EADDRINUSE WSAEADDRINUSE
 #undef EWOULDBLOCK