libgcrypt configure fixes

[Werner Koch]

Hi Albert,

you wrote quite some fixes; whoever I can't apply them unless you can
sign a disclaimer or copyright assignment for the FSF.  If you are
inclined to, please contact me by private mail. 

As a general note, both Moritz and me are quite busy with other
things, so libgcrypt repplies are delayed.  I still read them and hope
to find the time to answer them ASAP.  However, carnival starts
tomorrow and thus I am not sure whether I find the time to do much
work ;-)

  Werner