bug#39382: [PATCH] gnu: Add exa.

[Efraim Flashner]

I have to say I don't like the colors at all. Way too much.

There were a couple of changes I made across the patches. Sometimes the
default description was lacking and I changed it (This package provides
a ...). Where possible I removed the skip-build? argument.

On a side note I borrowed a patch from Debian to mark rust-openssl-sys
as providing rust-openssl-src and I was able to shorten one of the
phases in exa.

rust-datetime-0.4 actually wants rust-regex-0.1 for
cargo-development-inputs, so I added it in and commented it out. I think
I have a package for it locally, but I'm not sure it's really worth
adding.


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