tools/resolve_btfids: Tidy HOST_OVERRIDES

commit e0975ab upstream.

Don't set EXTRA_CFLAGS to HOSTCFLAGS, ensure CROSS_COMPILE isn't
passed through.

Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20230202224253.40283-1-irogers@google.com
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/bpf/resolve_btfids/Makefile

@@ -17,9 +17,9 @@ else
   MAKEFLAGS=--no-print-directory
 endif
 
-# always use the host compiler
+# Overrides for the prepare step libraries.
 HOST_OVERRIDES := AR="$(HOSTAR)" CC="$(HOSTCC)" LD="$(HOSTLD)" ARCH="$(HOSTARCH)" \
-		  EXTRA_CFLAGS="$(HOSTCFLAGS) $(KBUILD_HOSTCFLAGS)"
+		  CROSS_COMPILE=""
 
 RM      ?= rm
 HOSTCC  ?= gcc