[PATCH v3] Implement strlcpy [BZ #178]

[Florian Weimer]

This version is v2, rebased to current master, with a change to the
documentation to refer to the appropriate place in the GNU Coding Standards.

The reasons why I want to add this to glibc are unchanged.  We can do
much better than the existing implementations:  This version is based on
optimized strlen and memcpy implementations (the defaults, not the
optimized versions).  It has fortify support.  In fortify mode, there
are link-time warnings for common misuses.

Commit message:

This change may cause application code not to compile anymore, but
strlcpy is in the implementation namespace (per C11 7.31.13), so this
is an application issue.

Florian
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