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

CMakeLists.txt

@@ -430,6 +430,7 @@ if (ISLE_USE_SMARTHEAP)
 endif()
 foreach(tgt IN LISTS lego1_targets)
   target_link_libraries(${tgt} PRIVATE $<$<BOOL:${ISLE_USE_DX5}>:DirectX5::DirectX5>)
+  target_compile_definitions(${tgt} PRIVATE $<$<BOOL:${ISLE_USE_DX5}>:DIRECTX5_SDK>)
 endforeach()
 
 # Make sure filenames are ALL CAPS