Change in coreboot[master]: include: always unsigned long for size_t

[Jacob Garber (Code Review)]

Attention is currently required from: Nico Huber, Paul Menzel, Julius Werner.
Jacob Garber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55075 )

Change subject: include: always unsigned long for size_t
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Patch Set 1:

(1 comment)

Patchset:

PS1:
> size_t and ptrdiff_t are part of the language (there are operators that return […]

GCC provides types for all of the other fixed-width integers as well (it even provides its own version of <stdint.h> in freestanding mode), but one disadvantage of that is we loose control of the underlying integer types, and so will probably have to start using PRIuPTR and friends everywhere (bleh). Since those are just library types IMHO I think it's fine if we keep using our own typedefs, but ptrdiff_t should probably be fixed.