Merge tag 'kbuild-fixes-v5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/masahi...

Pull Kbuild fixes from Masahiro Yamada:

 - clean generated files in scripts/kconfig/ by 'make mrproper'

 - fix conflict between dead code elimination and ftrace for GCC <= 4.7

 - fix external module build with CONFIG_STACKPROTECTOR

 - remove unused code

* tag 'kbuild-fixes-v5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: mark prepare0 as PHONY to fix external module build
  openrisc: remove unneeded code in arch/openrisc/Makefile
  nds32: remove unneeded code in arch/nds32/Makefile
  ia64: remove redundant 'export AWK'
  kbuild: remove unused archmrproper
  kbuild: remove unused baseprereq
  kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7
  kconfig: clean generated *conf-cfg files