Try not to use ELF and GNU-EFI CRT

[Artoria2e5]

The whole process of making a ELF using gcc and then wrapping it into a PE is dumb. There are tools you can use to just make a PE directly. People seem to prefer LLVM/clang for that, since it supports all architectures by default via a --target switch.

• The basic CFLAGS is --target $(GCC_ARCH)-unknown-windows -ffreestanding -fshort-wchar -fno-stack-protector. You have most of that.
• The LDFLAGS are basically the same as what you have right now.

[Jamesits]

The makefile is copied from https://github.com/pbatard/uefi-simple/blob/c3c7d4b794322bb3b9c0483a569a83458eddda25/Makefile and I've never used it :( I'll try a migration to LLVM/clang.