`pkg-config gnutls --variable=crypto_lib`

[Arfrever Frehtes Taifersar Arahesis]

The attached patch adds support for `pkg-config gnutls --variable=crypto_lib`
so that users of GnuTLS can check crypto library used by GnuTLS.
It might be useful for build systems of packages, which use GnuTLS.

$ pkg-config gnutls --variable=crypto_lib
nettle

-- 
Arfrever Frehtes Taifersar Arahesis
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