Change in flashrom[master]: Makefile: clean up variables

[Thomas Heijligen (Code Review)]

Attention is currently required from: Nico Huber, Thomas Heijligen, Angel Pons.
Hello build bot (Jenkins), Nico Huber, Paul Menzel, Angel Pons,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/59230

to look at the new patch set (#6).

Change subject: Makefile: clean up variables
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Makefile: clean up variables

- replace $(LIBS) by $(LDFLAGS)
- use override to handle CPPFLAGS, CFLAGS, LDFLAGS
    This allows to append flags to the users input.
- remove unusd $(DIFF)

Change-Id: I1c9e869377677d624469af1ee9ece9a28fc3b559
Signed-off-by: Thomas Heijligen 
---
M Makefile
1 file changed, 4 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/30/59230/6