Investigate TODOs in files

[Vulpovile]

Several files have TODOs regarding changes or investigation for potential changes.
These include:

• src/native/windows/org_lwjgl_opengl_WindowsRegistry.c
• src/native/windows/org_lwjgl_opengl_Display.c
• src/native/windows/display.c
• src/native/windows/windows_al.c
• src/native/windows/windows_cl.c