Backports of isle-portable x64 fixes (#1044)

* Introduce LPD3DRM_APPDATA typedef for setting d3drm appdata

* Fix warning about assigning const string literals to variable char pointers

* Don't cast pointers to integers on non-32-bit architectures

* memset 2nd argument is int

* Assume cpuid is available on x86_64, needs testing on i386 and unavailable on anything else

* Store HFILE in its own member variable

LEGO1/tgl/d3drm/impl.h

@@ -5,6 +5,12 @@
 
 #include <d3drm.h>
 
+#ifdef DIRECTX5_SDK
+typedef DWORD LPD3DRM_APPDATA;
+#else
+typedef LPVOID LPD3DRM_APPDATA;
+#endif
+
 // Forward declare D3D types
 struct IDirect3DRM2;
 struct IDirect3DRMDevice2;