[coreboot-gerrit] [M] Change in coreboot[main]: Makefile.mk: Add a common link_stage function and use it

[Nico Huber (Code Review)]

Attention is currently required from: Arthur Heymans, Julius Werner, Jérémy Compostella, Philipp Hug, Ron Minnich.

Nico Huber has posted comments on this change by Arthur Heymans. ( https://review.coreboot.org/c/coreboot/+/83574?usp=email )

Change subject: Makefile.mk: Add a common link_stage function and use it
......................................................................

Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/83574/comment/41d450b8_ccd35649?usp... :
PS2, Line 16: - the x86 --oformat is dropped as it is not needed.
> > How would that look like? it's not just one linker script, right? […]

So we'd have to duplicate that file for x86?

Hmmm, looking through Makefiles, couldn't we just do something like
```
LDFLAGS_x86_32 += --oformat elf-i386
LDFLAGS_x86_64 += --oformat elf-x86-64
```
?
`toolchain.mk` should add that to the respective stages (all on x86, I guess).