build: use snake2camel go tool instead than awk

Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

makefile

@@ -22,11 +22,7 @@ docs: dots parser/docs/minimal_types.png parser/docs/falco_types.png parser/docs
 
 .PHONY: snake2camel
 snake2camel:
-	@awk -i inplace '{ \
-	while ( match($$0, /(.*)([a-z]+[0-9]*)_([a-zA-Z0-9])(.*)/, cap) ) \
-	$$0 = cap[1] cap[2] toupper(cap[3]) cap[4]; \
-	print \
-	}' $(file)
+	@go build ./tools/snake2camel
 
 .PHONY: removecomments
 removecomments:
@@ -78,10 +74,12 @@ parser/machine.go: parser/machine.go.rl common/common.rl
 
 parser/machine.go: removecomments
 
+parser/machine.go: snake2camel
+
 parser/machine.go:
 	$(RAGEL) -Z -G2 -e -o $@ $<
 	@./removecomments $@
-	$(MAKE) file=$@ snake2camel
+	@./snake2camel $@
 	$(GOFMT) $@
 
 .PHONY: tests