Remove obsolete TODO entries.

* TODO: remove BeOS multibyte entry (we fixed this by using the
gnulib wcwidth module; see https://savannah.gnu.org/bugs/?19979).
Remove comment about problems with gcc-2.95.2 on
sparc-sun-sunos4.1.3_U1; we'll look at the problem if anyone ever
complains that something doesn't work (though gnulib may in fact
no longer work on such an old platform in any case).
Remove some TODOs around locate performance; nobody's reported
performance issues, and we can examine any specific issues when
the arise.
Remove TODO about the largeness of depcomp; at 22KiB, it's much
smaller than this ChangeLog file, for example.

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