Add comment to explain why.
* winsup.h: Include winlean.h from C sources as well.
* libc/minires-os-if.c: Drop including ntdef.h.
Fix previous ChangeLog entry.
(ImpersonateNamedPipeClient): Add missing WINAPI.
* ntdll.h (STATUS_INVALID_PARAMETER): Only define if it isn't already.
(STATUS_DLL_NOT_FOUND): Ditto.
(STATUS_ENTRYPOINT_NOT_FOUND): Ditto.
(enum _EVENT_TYPE): Guard against redefinition since it's already
defined in Mingw64's ntdef.h.
(enum _TIMER_TYPE): Ditto.
(enum _SECTION_INHERIT): Define if using Mingw64 headers since it's
missing in Mingw64's ntdef.h.
* winlean.h (__STRALIGN_H_): Define before including windows.h.