basenc: prefer signed to unsigned integers

This patch modifies basenc to prefer signed integers to
unsigned, as signed are less error-prone.
This patch also updates Gnulib to to latest, which updates Gnulib’s
base32 and base64 modules to prefer signed to unsigned integers.
* src/basenc.c: Include idx.h.
(struct base2_decode_context): Use unsigned char, not unsigned
for an octet that must fit in an unsigned char.
(base_encode, struct base_decode_context)
(base64_decode_ctx_wrapper, prepare_inbuf, base64url_encode)
(base64url_decode_ctx_wrapper, base32_decode_ctx_wrapper)
(base32hex_encode, base32hex_decode_ctx_wrapper, base16_encode)
(base16_decode_ctx, z85_encode, Z85_HI_CTX_TO_32BIT_VAL)
(z85_decoding, z85_decode_ctx, base2msbf_encode)
(base2lsbf_encode, base2lsbf_decode_ctx, base2msbf_decode_ctx)
(wrap_write, do_encode, do_decode, main):
Prefer signed integers to unsigned.
(main): Treat extremely large wrap columns as if they were
infinite; that’s good enough.  Since we’re now using xstrtoimax,
this allows ‘-w -0’ (same as ‘-w 0’).
* tests/misc/base64.pl (gen_tests): -w-0 is no longer an error.

tests/misc/base64.pl

@@ -91,9 +91,6 @@ sub gen_tests($)
      ['wrap-bad-3', '-w-1', {IN=>''}, {OUT=>""},
       {ERR_SUBST => 's/base..:/base..:/'},
       {ERR => "base..: invalid wrap size: '-1'\n"}, {EXIT => 1}],
-     ['wrap-bad-4', '-w-0', {IN=>''}, {OUT=>""},
-      {ERR_SUBST => 's/base..:/base..:/'},
-      {ERR => "base..: invalid wrap size: '-0'\n"}, {EXIT => 1}],
 
      ['buf-1',   '--decode', {IN=>&$enc(1)}, {OUT=>'a' x 1}],
      ['buf-2',   '--decode', {IN=>&$enc(2)}, {OUT=>'a' x 2}],