Add workaround for broken strndup() in firefox
Add workaround for broken strndup() in firefox

Unconditionally use our own strndup() until this issue is resolved
and in the stable versions of various distros.

See: https://bugzilla.mozilla.org/show_bug.cgi?id=826171

freedesktop-unofficial-mirror/p11-glue__p11-kit,pspacek/p11-kit,pspacek/p11-kit,lkundrak/p11-kit,lkundrak/p11-kit,Distrotech/p11-kit,freedesktop-unofficial-mirror/p11-glue__p11-kit,Distrotech/p11-kit,Distrotech/p11-kit,freedesktop-unofficial-mirror/p11-glue__p11-kit,lkundrak/p11-kit,pspacek/p11-kit,Distrotech/p11-kit,pspacek/p11-kit