Fix compilere warnings:
v_utils.c:236:3: warning: passing argument 2 of ‘signal’ from incompatible pointer type [enabled by default]
In file included from vgrabbj.h:48:0,
from v_utils.h:24,
from v_utils.c:24:
/usr/include/signal.h:101:23: note: expected ‘__sighandler_t’ but argument is of type ‘void (*)(void)’
