vulkan/wsi: unbreak win32-support

There's no unistd.h on Windows, let's not include it unconditionally.

But we also don't want to deal with DRM modifiers or DMABUFs on Windows,
so let's also ifdef out the rest of that stuff.

Fixes: a8b009aed6 ("vulkan/wsi: fix missing unistd include")
Fixes: c72ff19a9e ("vulkan/wsi: Close file descriptors in wsi_destroy_image")

Reviewed-By: Yonggang Luo <luoyonggang@gmail.com>
Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16373>

src/vulkan/wsi/wsi_common.c

@@ -38,7 +38,10 @@
 #include <time.h>
 #include <stdlib.h>
 #include <stdio.h>
+
+#ifndef _WIN32
 #include <unistd.h>
+#endif
 
 VkResult
 wsi_device_init(struct wsi_device *wsi,
@@ -477,7 +480,10 @@ wsi_create_image(const struct wsi_swapchain *chain,
    VkResult result;
 
    memset(image, 0, sizeof(*image));
+
+#ifndef _WIN32
    image->dma_buf_fd = -1;
+#endif
 
    result = wsi->CreateImage(chain->device, &info->create,
                              &chain->alloc, &image->image);
@@ -512,8 +518,10 @@ wsi_destroy_image(const struct wsi_swapchain *chain,
 {
    const struct wsi_device *wsi = chain->wsi;
 
+#ifndef _WIN32
    if (image->dma_buf_fd >= 0)
       close(image->dma_buf_fd);
+#endif
 
    if (image->buffer.blit_cmd_buffers) {
       for (uint32_t i = 0; i < wsi->queue_family_count; i++) {

src/vulkan/wsi/wsi_common_private.h

@@ -74,12 +74,16 @@ struct wsi_image {
       VkCommandBuffer *blit_cmd_buffers;
    } buffer;
 
+#ifndef _WIN32
    uint64_t drm_modifier;
+#endif
    int num_planes;
    uint32_t sizes[4];
    uint32_t offsets[4];
    uint32_t row_pitches[4];
+#ifndef _WIN32
    int dma_buf_fd;
+#endif
 };
 
 struct wsi_swapchain {