libtasn1-4.9 ctype issue

[Thomas Klausner]

Hi!

Compilation of libtasn1 on NetBSD fails with the default setting of
-Werror because of:

ASN1.y: In function '_asn1_yylex':
ASN1.y:578:9: error: array subscript has type 'char' [-Werror=char-subscripts]
         if (!isdigit (string[k]))
         ^

NetBSD is pickier with ctype macros than most other operating systems.
Details about this are e.g. at
http://netbsd.gw.com/cgi-bin/man-cgi?ctype++NetBSD-current
in the CAVEATS section.

In short: The argument should be cast to (unsigned char) after making
sure that that is correct.

Please fix this for the next release.

One other comment:
Please make the bug report address more visible in the README.

Cheers,
 Thomas