* include/mes/lib.h[__M2__](__call_at_exit,abtod,dtoab,ultoa,
* include/sys/types.h[__M2__]: Fall back to unsigned instead of using
unsigned long.
* include/stdio.h[__M2__](fprintf, fscanf, printf, snprintf, sprintf,
sscanf): Hide prototypes.
* lib/stdlib/exit.c (exit)[__M2__]: Hide call to __call_at_exit.
* lib/linux/read.c (read)[__M2__]: Hide debugging.
* lib/linux/malloc.c (malloc)[__M2__]: Hide alignment.
__mesabi_umod, __mesabi_udiv, __mesabi_uldiv): Hide prototypes.
* scaffold/argv.kaem: Use them together with lib/mes/lib-mini.h instead of
lib/mes/* specializations. Remove --bootstrap-mode from M2-Planet call.
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