[ITP] libb2 0.98.1

[Daisuke Fujimura]

> it builds fine, and I added it to the package list.
>
> However, for me make little sense to make a package with just
> two documentation files.
> I would fit them in the libb2-devel package
> leaving libb2 as source only

I fixed it.

Cygportfile, packages and logs (updated)
- https://yacp.osdn.jp/itp/libb2/

Cygport diff
- https://cygwin.com/git-cygwin-packages/?p=git/cygwin-packages/playground.git;a=commitdiff;h=bf5426f80130e75260f829c20611b11e82b6fcee

CI (playground)
- https://cygwin.com/cgi-bin2/jobs.cgi?id=1221
- https://ci.appveyor.com/project/cygwin/scallywag/builds/36174475

Package list (as follows)
- https://yacp.osdn.jp/itp/libb2/libb2-0.98.1-1.x86_64/log/libb2-0.98.1-1-pkg.log

```
>>> Creating binary package(s)
>>> libb2_1-0.98.1-1.tar.xz
usr/bin/
usr/bin/cygb2-1.dll

>>> libb2-devel-0.98.1-1.tar.xz
usr/include/
usr/include/blake2.h
usr/lib/
usr/lib/libb2.dll.a
usr/lib/pkgconfig/
usr/lib/pkgconfig/libb2.pc
usr/share/
usr/share/doc/
usr/share/doc/libb2/
usr/share/doc/libb2/COPYING
usr/share/doc/libb2/README.md
```