Control: tags -1 + patch

Hi,

For my work in making PAM configurable in Guile, I rely on the foreign
function interface (FFI). The automatic generation of that interface
requires the compile-ffi script in nyacc. Unfortunately, the highest
version we ship suffers from a bug that prevents the script from
running on the pam_client.h header in linux-pam.  This patch upgrades
nyacc to the version Matt Wette released after committing the fix.

The changes are further documented in the commit message.

I am new to Guix and already use the new version of linux-pam locally
(via Guix System) but I was unable to test the patch according to the
requirements and recommendations listed for this submission. [1]

This email was sent to -devel in lieu of -mentors, which does not
exist. Any guidance is much appreciated. Thanks for taking a look!

KInd regards
Felix Lechner

[1] https://guix.gnu.org/en/manual/devel/en/html_node/Submitting-Patches.html