UPSTREAM: objtool: Fix HOSTCC flag usage

HOSTCC is always wanted when building objtool. Setting CC to HOSTCC
happens after tools/scripts/Makefile.include is included, meaning
flags (like CFLAGS) are set assuming say CC is gcc, but then it can be
later set to HOSTCC which may be clang. tools/scripts/Makefile.include
is needed for host set up and common macros in objtool's
Makefile. Rather than override the CC variable to HOSTCC, just pass CC
as HOSTCC to the sub-makes of Makefile.build, the libsubcmd builds and
also to the linkage step.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20230126190606.40739-4-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: I1d672d0bb64f72d3fc571537de5f75d4068e79cc
(cherry picked from commit cd955bdd)
Signed-off-by: Yifan Hong <elsk@google.com>