Always prefer the external <stdarg.h> for MSVC compilation

The __builtin_va_###() intrinsics apply only to GCC-like compilers and
MSVC's <stdarg.h> works just fine with gnu-efi.
Without this patch,

Always prefer the external <stdarg.h> for MSVC compilation

The __builtin_va_###() intrinsics apply only to GCC-like compilers and
MSVC's <stdarg.h> works just fine with gnu-efi.
Without this patch, one has to define GNU_EFI_USE_EXTERNAL_STDARG to
make gnu-efi work with a Microsoft toolchain, which is annoying...

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The gnu-efi-3.0 toplevel subdirectory is really annoying. Kill it.

Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Nigel Croxon <nigel.croxon@hp.com>