Add strtol_l and friends. Switch _citrus_bcs_strtol to use plain
strtol_l unless in tools mode. Add note to retire the BCS code on the
next libc major bump.

Prepare use of strtoull, strtoumax and strtoimax in tools/compat by
including nbtool_config.h.

Properly deal with LIBC namespace issues.

Fix build breakage by adding appropriate #includes.
Patch from joerg@

Unify the implementation of strto{l,ul,ll,ull,imax,umax,q,uq} into one
version for signed and one version for unsigned data types.

Add a check for supported bases and set errno (userland) or panic
(

Unify the implementation of strto{l,ul,ll,ull,imax,umax,q,uq} into one
version for signed and one version for unsigned data types.

Add a check for supported bases and set errno (userland) or panic
(kernel, libsa) otherwise.

Make strto{ll,ull,imax,umax} normal symbols and just keep the underscore
versions as strong alias.

Obtained from DragonFly, based on the wide char version from Citrus.
Reviewed by christos@

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Move strtoumax.c from libc/stdlib to common/libc/stdlib and include it
in libkern. Required for new code coming soon.