Rename "fuzz" makefile target to "check-fuzzer".

It's purpose is to run the fuzzers are part of a normal "make check"
to avoid bit rot, not to perform a fuzzer run.
The fuzz_logsrvd_conf fuzzer was not wired up to "make check" previously.

plugins/python/Makefile.in

@@ -220,9 +220,9 @@ realclean: distclean
 
 cleandir: realclean
 
-fuzz:
+check-fuzzer:
 
-check: $(TEST_PROGS)
+check: $(TEST_PROGS) check-fuzzer
 	@if test X"$(cross_compiling)" != X"yes"; then \
 	    if locale -a 2>&1 | grep '^C.UTF-8$$' >/dev/null 2>&1; then \
 		LC_ALL=C.UTF-8; export LC_ALL; \