time_t need time.h
Apply drcs conversion table on initializing.
i_drcs_num is used by both decoder and parser.
decoder should not modify i_drcs_num.

Conflicts:
	src/decoder.c
Revert "Remove unused apply_drcs_conversion_table function."

This reverts commit d9f659ff10439a047d9a8eb4f2a27b163ec05348.