nconf: fix build where ncurses headers are in subdirectories

[kconfig-frontends] / scripts / ksync.log

MCA: delete all remaining traces of microchannel bus support.
scripts/config: properly report and set string options
kbuild: all{no,yes,mod,def,rand}config only read files when instructed to.
kconfig: Add error handling to KCONFIG_ALLCONFIG