usb: Support compilation without poll.h

This is a hack to support compilation with Mingw-w64 which provides
a libusb-1.0 package, but no poll.h.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Message-id: 1458630800-10088-1-git-send-email-sw@weilnetz.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/host-libusb.c

@@ -34,7 +34,9 @@
  */
 
 #include "qemu/osdep.h"
+#ifndef CONFIG_WIN32
 #include <poll.h>
+#endif
 #include <libusb.h>
 
 #include "qapi/error.h"
@@ -204,6 +206,8 @@ static const char *err_names[] = {
 static libusb_context *ctx;
 static uint32_t loglevel;
 
+#ifndef CONFIG_WIN32
+
 static void usb_host_handle_fd(void *opaque)
 {
     struct timeval tv = { 0, 0 };
@@ -223,9 +227,13 @@ static void usb_host_del_fd(int fd, void *user_data)
     qemu_set_fd_handler(fd, NULL, NULL, NULL);
 }
 
+#endif /* !CONFIG_WIN32 */
+
 static int usb_host_init(void)
 {
+#ifndef CONFIG_WIN32
     const struct libusb_pollfd **poll;
+#endif
     int i, rc;
 
     if (ctx) {
@@ -236,7 +244,9 @@ static int usb_host_init(void)
         return -1;
     }
     libusb_set_debug(ctx, loglevel);
-
+#ifdef CONFIG_WIN32
+    /* FIXME: add support for Windows. */
+#else
     libusb_set_pollfd_notifiers(ctx, usb_host_add_fd,
                                 usb_host_del_fd,
                                 ctx);
@@ -247,6 +257,7 @@ static int usb_host_init(void)
         }
     }
     free(poll);
+#endif
     return 0;
 }