Keep them around until they are cleaned up by make clean. This
uses a bit more disk space, but makes it easier to debug any
problems with the kernel link process.
Suggested-by: NMasahiro Yamada <masahiroy@kernel.org>
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NMasahiro Yamada <masahiroy@kernel.org>