arch/arm64/Makefile.inc: Avoid # in variable definition

Interpretation if # starts a comment inside a variable definition varies
between GNU make versions. Use a wildcard to match the first # and use
`sed` instead of `grep | cut` to avoid unbalanced quoting chars.

Tested with GNU make 4.2.1 and 4.3. Both produce the same output as
4.2.1 did before the patch.

Change-Id: Ib7c4d7323e112968d3f14ea0590b7dabc57c9c45
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38794
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>

0 files changed, 0 insertions, 0 deletions