Log message:
cppcodec: adapt for catch2 version 3 api
Add pkg-config to tools, this is to make
sure that cppcodec uses pkgsrc catch2
and does not download its own copy.
Add patches to use catch2 version 3 api.

Log message:
cppcodec: import as devel/cppcodec version 0.2

Header-only C++11 library to encode/decode base64, base64url, base32, base32hex
and hex (a.k.a. base16) as specified in RFC 4648, plus Crockford's base32.

MIT licensed with consistent, flexible API. Supports raw pointers, std::string
and (templated) character vectors without unnecessary allocations.
Cross-platform with measured decent performance and without compiler warnings.