ext/cdparanoia/gstcdparanoiasrc.*: Add back 'transport-error' and 'uncorrected-error' signals and make them actually ...

Original commit message from CVS:
* ext/cdparanoia/gstcdparanoiasrc.c:
(gst_cd_paranoia_src_class_init), (gst_cd_paranoia_dummy_callback),
(gst_cd_paranoia_paranoia_callback),
(gst_cd_paranoia_src_signal_is_being_watched),
(gst_cd_paranoia_src_read_sector):
* ext/cdparanoia/gstcdparanoiasrc.h:
Add back 'transport-error' and 'uncorrected-error' signals and
make them actually be fired when bad stuff happens (#319340).