fuzz: use new fuzzit (#3193)

Upgrade to new version and add if-not-exists to the cmdline
Signed-off-by: Miek Gieben <miek@miek.nl>

Makefile

@@ -55,7 +55,7 @@ ifeq ($(TEST_TYPE),fuzzit)
 		LIBFUZZER=YES $(MAKE) -f Makefile.fuzz all; \
 		$(MAKE) -sf Makefile.fuzz fuzzit; \
 		for i in `$(MAKE) -sf Makefile.fuzz echo`; do echo $$i; \
-			./fuzzit create job --type $(FUZZIT_TYPE) coredns/$$i ./$$i; \
+			./fuzzit create job --if-not-exists --type $(FUZZIT_TYPE) coredns/$$i ./$$i; \
 		done; \
 	fi;
 endif

Makefile.fuzz

@@ -17,7 +17,7 @@
 # GO111MODULE=off go get github.com/dvyukov/go-fuzz/go-fuzz-build
 
 REPO:="github.com/coredns/coredns"
-FUZZIT:=v2.4.28
+FUZZIT:=v2.4.35
 # set LIBFUZZER=YES to build libfuzzer compatible targets
 
 FUZZ:=$(dir $(wildcard plugin/*/fuzz.go)) # plugin/cache/