All .c files can be built as separate fuzz targets. This simplifies the Makefile by allowing us to use wildcards instead of having a Makefile target for each fuzz target.
https://github.com/google/oss-fuzz/pull/3219#issuecomment-573751048 Thanks to Bhargava Shastry for sending the patch.
Thanks to Bhargava Shastry and Github user pdknsk.