[PATCH 13/13] Re-enable and clean up "check_config()" in headers_check.pl

[kbuild test robot]

Hi Palmer,

[auto build test WARNING on v4.3-rc7]
[also WARNING on: next-20151103]

url:    https://github.com/0day-ci/linux/commits/Palmer-Dabbelt/Remove-ifdef-CONFIG_64BIT-from-all-asm-generic-fcntl-h/20151104-035501
base:   https://github.com/0day-ci/linux Palmer-Dabbelt/Remove-ifdef-CONFIG_64BIT-from-all-asm-generic-fcntl-h/20151104-035501
config: alpha-defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All warnings (new ones prefixed by >>):

>> ./usr/include/asm/setup.h:16: leaks CONFIG_ALPHA_LEGACY_START_ADDRESS to userspace where it is not valid

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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