The attached patch allows building the perl module with newer libgcrypt 1.6.x. It removes some stub code for asymmetric crypto which was not yet supported in the perl module, anyway. See PR 191256 for the pending update of libgcrypt. See also for the patch upstream. https://rt.cpan.org/Ticket/Display.html?id=97201 Please approve.
Committed in r363436 with all the changes for 191256