Relocate global sm variable to reduce include file deps

The new state machine handling is not necessary to export to external
plugins, so this patch reduces the exposure of the global variable sm

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

finit.c

@@ -54,7 +54,6 @@ char *hostname  = NULL;
 char *rcsd      = FINIT_RCSD;
 char *runparts  = NULL;
 char *console   = NULL;
-sm_t sm;
 
 uev_ctx_t *ctx  = NULL;		/* Main loop context */