[ATTN maintainer] libunistring 1.3 needed

[Brian Inglis]

Hi Erwin,

Could you please package the latest libunistring 1.3 (available since last 
October) as it appears it should fix issues I have updating gettext, according 
to the upstream maintainer of both.

I have successfully built a local copy and pushed an update to the CI playground 
repo:
	https://cygwin.com/cgi-bin2/jobs.cgi?srcpkg=libunistring&id=10200

https://cygwin.com/cgit/cygwin-packages/libunistring/commit/?id=e3b60bdc62e0b271061159b42391f20606cdb90d

also defining LICENSE (from README, COPYING.LIB, COPYING) and BUILD_REQUIRES 
(from DEPENDENCIES), adding ABI for SO/DLL version, and use in `declare` 
variable definitions, to make future updates easier (tip from Jon Turney).

 From what I have seen in recent builds, you may no longer need the CFLAGS you 
define, as they all seem to do that, possibly from using gnulib with autotools.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry