Move time_t conversions to rc-misc.c so they can be shared

src/includes/rc-misc.h

@@ -23,6 +23,7 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
 
 #include "helpers.h"
@@ -68,5 +69,7 @@ RC_DEPTREE *_rc_deptree_load (int, int *);
 bool _rc_can_find_pids(void);
 
 RC_SERVICE lookup_service_state(const char *service);
+char *from_time_t(time_t tv);
+time_t to_time_t(char *timestring);
 
 #endif