Change in flashrom[master]: Makefile: Make pkg-config mandatory to find libpci

[Thomas Heijligen (Code Review)]

Attention is currently required from: Nico Huber.
Thomas Heijligen has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/59050 )

Change subject: Makefile: Make pkg-config mandatory to find libpci
......................................................................

Patch Set 12:

(2 comments)

Patchset:

PS12:
> > I'm not 100% sure it's a move into the right direction. […]

I've an idea how to implement this. I would do this in a follow up patch.

Makefile:

ifeq ($(HAS_LIBPCI),no)
$(call mark_unsupported, $(DEPENDS_ON_LIBPCI))
endif

HAS_LIBPCI := $(call find_dependency, libpci)

ifeq ($(HAS_LIBPCI),no)
$(call disable, $(DEPENDS_ON_LIBPCI))
endif

File Makefile:

https://review.coreboot.org/c/flashrom/+/59050/comment/987be984_7b93e8a0 
PS7, Line 772: # This is a dirty hack, but it saves us from checking all PCI drivers and all platforms manually.
             : # libpci may need raw memory, MSR or PCI port I/O on some platforms.
             : # Individual drivers might have the same needs as well.
> Doesn't this comment stay valid? I guess we should at some point untangle our […]

We should split pci programmers to DEPENDS_ON_IO_PORTS, DEPENDS_ON_RAW_MEM_ACCESS, DEPENDS_ON_X86_MSR