[v]snprintf()
Otherwise it clashes when we want to re-introduce the `xmpp_` prefix'ed versions. Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
Fixes #189 Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
Use HAVE_SNPRINTF and HAVE_VSNPRINTF to conditionnaly use an internal version of these functions or use the libc one.