[flashrom-gerrit] Change in flashrom[master]: Makefile: Fix building on AArch64 NixOS

[Pyry Kontio (Code Review)]

Hello build bot (Jenkins), David Hendricks, Angel Pons,

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

https://review.coreboot.org/c/flashrom/+/43140

to look at the new patch set (#2).

Change subject: Makefile: Fix building on AArch64 NixOS
......................................................................

Makefile: Fix building on AArch64 NixOS

The parsing of the output of archtest.c produced an unexpected
value on AArch64 NixOS. For example, the make variable ARCH was set to:

```
bit outside of fd_set selected
arm
```

This made the arch and OS checks fail.
This commit addresses this case, making the parsing more robust.

Signed-off-by: Pyry Kontio 
Change-Id: Iaa4477a71e758cf9ecad2c22f3b77bc6508a3510
---
M Makefile
1 file changed, 8 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/40/43140/2