UPSTREAM: objtool: Properly support make V=1

The Q variable was being used but never correctly set up. Add the
setting up and use in place of @.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20230126190606.40739-3-irogers@google.com


Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

Bug: 336872347
Bug: 335829879
Test: build x86_64 kernel with glibc 2.38
Change-Id: I2ac9a1d0c3a56c6109375e92b3d46e08fd5a71cd
(cherry picked from commit 8c4526ca)
Signed-off-by: Yifan Hong <elsk@google.com>