main: add more information to `nft -V`.

In addition to the package-version and release-name, output the CLI
implementation (if any) and whether mini-gmp was used, e.g.:

    $ ./src/nft -V
    nftables v0.9.3 (Topsy)
      cli:          linenoise
      json:         yes
      minigmp:      no
      libxtables:   yes

[pablo@netfilter.org: add json and libxtables, use -V ]

Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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