src: use limits.h header
src: use limits.h header

values.h is not present on other systems, and the glibc copy reads
right away: Old compatibility names for <limits.h> and <float.h>
constants.

Signed-off-by: Jan Engelhardt <f383ed465f890d2e8ea864dd0c28cf8ec50a8942@medozas.de>

vyos/libmnl,vyatta/libmnl,greearb/libmnl-ct,remfalc/vyt-libmnl,threatstack/libmnl,remfalc/vyt-libmnl,vyatta/libmnl,cyclops8456/libmnl,vyos/libmnl,vyos/libmnl,Distrotech/libmnl,threatstack/libmnl,cyclops8456/libmnl,fqrouter/libmnl,Distrotech/libmnl,greearb/libmnl-ct,chamaken/libmnl,chamaken/libmnl,cyclops8456/libmnl,fqrouter/libmnl