graphics/s2tc vs graphics/libtxc_dxtn

[David Naylor]

Hi,

While addressing a user reported issue with i386-wine-staging I created a port 
based on the GitHub repo https://github.com/divVerent/s2tc to provide the 
libtxc_dxtn library.  

I now realise that I erroneously committed a port that duplicates 
graphics/libtxc_dxtn.  Given that these ports are not identical I suggest we 
merge the ports and drop one of them.  

To describe the major differences:

graphics/s2tc:
 + Based on a newer version of upstream (at 20151228)
 + Provides the s2tc tools (including man pages)
 + Has working (and passing) unit tests
graphics/libtxc_dxtn:
 - Does not provide the s2tc tools (explicitly intended)

I am in favour of keeping s2tc if we include the tools, otherwise think we 
should drop that port.  

Regards,

David
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