Pull gcc-plugins updates from Kees Cook:

 - Clean up gcc plugin builds now that GCC must be 4.9+ (Masahiro
   Yamada)

 - Update MAINTAINERS (Kees Cook)

* tag 'gcc-plugins-v5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  MAINTAINERS: Drop inactive gcc-plugins maintainer
  gcc-plugins: simplify GCC plugin-dev capability test
  gcc-plugins: remove code for GCC versions older than 4.9