kbuild, headers.sh: Don't make archheaders explicitly

We don't need to explicitly invoke the archheaders target because of
the dependency on __headers in the Makefile.

Reported-and-tested-by: Michal Marek <mmarek@suse.cz>
Link: http://lkml.kernel.org/r/4ECA8991.20302@suse.cz
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

scripts/headers.sh

@@ -7,7 +7,6 @@ set -e
 do_command()
 {
 	if [ -f ${srctree}/arch/$2/include/asm/Kbuild ]; then
-		make ARCH=$2 KBUILD_HEADERS=$1 archheaders
 		make ARCH=$2 KBUILD_HEADERS=$1 headers_$1
 	else
 		printf "Ignoring arch: %s\n" ${arch}