Fix SLURM issues, and compile warning.

Fix SLURM issues, and compile warning.

-SLURM filters weren't correctly applied when the filter had a prefix and an asn, only the asn was taken into account.
-Another error at filters, if a prefix X covered ROA prefix Y, the ROA prefix wasn't filtered; so apply the filter as specified in RFC 8416.
-Remove compile warning '_BSD_SOURCE and _SVID_SOURCE are deprecated', and set '_DEFAULT_SOURCE' at generated code by asn1c 'GeneralizedTime.c'.