[Patch] use Requires.private do avoid unnecessary linkage

[Andreas Metzler]

Hello,

find attached a one-line patch to avoid unnecessary linkage when using
pkg-config. For dynamic linking it is not necessary to link libgpg-error
when linking against libgcrypt (unless functions from libgpg-error are
used directly, obviously).

With this patch this works.
(sid)ametzler at argenau:$ pkg-config --libs libgcrypt
-lgcrypt
(sid)ametzler at argenau:$ pkg-config --libs --static libgcrypt
-lgcrypt -lgpg-error

TIA, cu Andreas

-- 
`What a good friend you are to him, Dr. Maturin. His other friends are
so grateful to you.'
`I sew his ears on from time to time, sure'
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