* src/cut.c (convfail,CONVFAIL): Change to bool to avoid a GCC
warning about signed vs. unsigned. Also avoid "set but not used"
of convfail in cut_characters_or_cut_bytes_no_split.
(cut_fields_mb): Fix indentation.
* src/expand.c: Add include for wctype.h to declare isblank().
* src/fold.c (fold_file): Add "const" attribute to 'filename' parameter
to avoid "const cast away" in call in main().
* src/join.c (xfields_multibyte): Remove unused variable 't'.
(keycmp): Evaluate the return value of wcrtomb(). Furthermore,
when copying 'beg' to 'copy' array elements, remove the unnecessary
cast to unsigned.
(main): When assigning the newline string to 'newtab', cast away the
implicit const.
* src/pr.c: Remove the unneeded include of wctype.h and the define
of iswprint().
(print_stored): Add the unsigned qualifier to 'first' and 'last' to
avoid a signedness warning.
* src/sort.c (getmonth_mb): Cast away the 'const' qualifier of 's'
when assigning to *ea.
* src/uniq.c (different_multi): Evaluate the return result of wcrtomb();
Add the include of assert.h for that.
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