Remove Ferite parser from c.c
This language seems officially dead (last release from 2004, its
"master site" link to www.ferite.org linking to a porn page, other
mirrors dead and nearly no downloads from the Sourceforge site and those
few are just probably from some bots). RIP.
Since we should try reduce differences against uctags and this language
isn't worth submitting to uctags, I'd suggest to remove the support
of its parser from c.c.
The filetype can still stay as it doesn't mean any maintenance cost for
us.
For reference, Ferite parser was introduced in:
010d6581e5d567c5479f2ca643922a0ef6ccadf2
We need to keep original identifiers for parsers we want to keep so let's
keep some dummy value for the removed parser (which can later be
filled in by a newly added parser).