This gets rid of many (incorrect) patches. The helper binaries are also
moved to a dedicated folder with this change (libexec/sloccount), in order
to avoid pollution in BINDIR. As a result functionality is currently broken
except when adding $LOCALBASE/libexec/sloccount to $PATH.
It might be a good idea to let sloccount's original binary in
libexec/sloccount, while providing a wrapper around it which would then set
$PATH accordingly.
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