Change in flashrom[master]: Makefile: move OS determination test into the Makefile

[Thomas Heijligen (Code Review)]

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

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

https://review.coreboot.org/c/flashrom/+/58015

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

Change subject: Makefile: move OS determination test into the Makefile
......................................................................

Makefile: move OS determination test into the Makefile

Change-Id: Id911f17f4100f242e1fde10d23a8459ddf38b369
Signed-off-by: Thomas Heijligen 
---
M Makefile
M Makefile.include
D os.h
M util/ich_descriptors_tool/Makefile
4 files changed, 48 insertions(+), 75 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/15/58015/4