loader: Started plumbing the platform extensions.
diff --git a/loader/loader.h b/loader/loader.h
index f170f4d..c6e6457 100644
--- a/loader/loader.h
+++ b/loader/loader.h
@@ -32,6 +32,14 @@
 #ifndef LOADER_H
 #define LOADER_H
 
+#if defined _WIN32
+#define VK_USE_PLATFORM_WIN32_KHR
+#else
+//#define VK_USE_PLATFORM_MIR_KHR
+//#define VK_USE_PLATFORM_WAYLAND_KHR
+#define VK_USE_PLATFORM_XCB_KHR
+//#define VK_USE_PLATFORM_XLIB_KHR
+#endif
 #include <vulkan/vulkan.h>
 #include <vk_loader_platform.h>