Change in flashrom[master]: Makefile: Revise build options for Linux specific headers

[Thomas Heijligen (Code Review)]

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

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

https://review.coreboot.org/c/flashrom/+/58627

to look at the new patch set (#4).

Change subject: Makefile: Revise build options for Linux specific headers
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Makefile: Revise build options for Linux specific headers

Clean up the feature target by outsourcing the test to an own variable.
Change the print output and don't write to the build-details file.

This is in preparation for further changes.

Change-Id: I18fc27252afb49fa7d1f2787faee2b5b669275aa
Signed-off-by: Thomas Heijligen 
---
M Makefile
A Makefile.d/linux_i2c_test.c
A Makefile.d/linux_mtd_test.c
A Makefile.d/linux_spi_test.c
M Makefile.include
5 files changed, 47 insertions(+), 80 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/27/58627/4