config-scripts/cups-ssl.m4: Remove Libgcrypt detection
config-scripts/cups-ssl.m4: Remove Libgcrypt detection

Upstream a change from the book *Beyond Linux From Scratch* [1].

> Prevent configure script from searching libgcrypt-config, because
> libgcrypt is not used anywere else in the package.

[1] http://www.linuxfromscratch.org/blfs/view/svn/pst/cups.html

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