Win32: resolve some symbols re-definition of windows.h in glfw3native.h

This reflects GLFW's fix: glfw/glfw#1348

This enables to build with a external GLFW containing the
following fix:

* glfw/glfw@05f6c13

Currently, glfw3native.h of the internal GLFW is customized at
2feea87

This fix is compatible with the current customized glfw3native.h.

This fix enables us to update it to the latest and remove the
customization.

src/rcore.c

@@ -214,8 +214,12 @@
 
     // Support retrieving native window handlers
     #if defined(_WIN32)
+        typedef void *PVOID;
+        typedef PVOID HANDLE;
+        typedef HANDLE HWND;
         #define GLFW_EXPOSE_NATIVE_WIN32
-        #include "GLFW/glfw3native.h"       // WARNING: It requires customization to avoid windows.h inclusion!
+        #define GLFW_NATIVE_INCLUDE_NONE // To avoid some symbols re-definition in windows.h
+        #include "GLFW/glfw3native.h"
 
         #if defined(SUPPORT_WINMM_HIGHRES_TIMER) && !defined(SUPPORT_BUSY_WAIT_LOOP)
             // NOTE: Those functions require linking with winmm library