Fix warning because of wrong time_t format specifier on FreeBSD i386
and fix places where format specifier is hardcoded for time_t and
correctly use PRItime_t instead.

src/epg.c:1412: warning: format '%ld' expects type 'long int', but argument 7 has type 'time_t'
src/dvr/dvr_rec.c:596: warning: format '%ld' expects type 'long int', but argument 4 has type 'time_t'
src/epggrab/module/eit.c:536: warning: format '%lu' expects type 'long unsigned int', but argument 8 has type 'time_t'