Build fail on gentoo

[thunderwolf66102]

Build fails on gentoo -

libtool: compile: gcc -DHAVE_CONFIG_H -I. -I../src/libpki -I../src -D__LIB_BUILD__ -I/usr/include -O2 -march=native -pipe -fstack-check -maccumulate-outgoing-args -Werror -Wfatal-errors -Wunused-variable -DENABLE_ECDSA=1 -I/usr/include/libxml2 -I/usr/include/mysql -DLINUX -DLINUX -O2 -march=native -pipe -fstack-check -maccumulate-outgoing-args -Werror -Wfatal-errors -MT libpki_la-pki_config.lo -MD -MP -MF .deps/libpki_la-pki_config.Tpo -c pki_config.c -fPIC -DPIC -o .libs/libpki_la-pki_config.o
In file included from /usr/include/string.h:519,
from ./libpki/net/sock.h:32,
from ./libpki/pki.h:312,
from pki_config.c:3:
In function ‘strncpy’,
inlined from ‘_xml_search_namespace_add’ at pki_config.c:86:2,
inlined from ‘PKI_CONFIG_get_element_stack’ at pki_config.c:472:14:
/usr/include/bits/string_fortified.h:91:10: error: ‘__builtin_strncpy’ specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
91 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[dcooper16]

This appears to be the same as #52, which would be fixed by #46 and #47.