Update Makefile to use jbuilder.

Makefile

@@ -1,46 +1,16 @@
-TARGETS = okafka.cma okafka.cmxa okafka.cmxs okafka.a dllocamlkafka.so libocamlkafka.a
-LIB = $(addprefix _build/, $(TARGETS))
-TOOLS = tail_kafka_topic.native sendto_kafka_topic.native
+all:
+	jbuilder build @install
 
-CFLAGS = -cflag -safe-string -cflag -bin-annot
-
-all: librdkafka-version
-	rm -f libocamlkafka.clib okafka.mllib META
-	ln -s libocamlkafka.clib.sync libocamlkafka.clib
-	ln -s okafka.mllib.sync okafka.mllib
-	ln -s META.sync META
-	ocamlbuild -use-ocamlfind $(CFLAGS) kafka.ml $(TARGETS)
-
-LWT_OPT = -cflags -ccopt,-I,-ccopt,$(shell ocamlfind query lwt.unix)
-lwt: librdkafka-version
-	rm -f libocamlkafka.clib okafka.mllib META
-	ln -s libocamlkafka.clib.lwt libocamlkafka.clib
-	ln -s okafka.mllib.lwt okafka.mllib
-	ln -s META.lwt META
-	ocamlbuild -use-ocamlfind $(LWT_OPT) -pkgs lwt,lwt.unix kafka.ml $(CFLAGS) $(TARGETS)
-
-librdkafka-version: librdkafka-version.c
-	$(CC) -o librdkafka-version librdkafka-version.c -lrdkafka
-
-_build/tests.native:
-	ocamlbuild -use-ocamlfind $(LWT_OPT) -pkgs lwt,lwt.unix -libs okafka $(CFLAGS) tests.native
-
-install:
-	ocamlfind install okafka META $(LIB) _build/kafka*.cmi _build/kafka*.mli _build/kafka*.cmt* _build/kafka*cmx
+install: all
+	jbuilder install
 
 uninstall:
-	ocamlfind remove okafka
-
-tools: lwt
-	ocamlbuild -use-ocamlfind $(LWT_OPT) -pkgs lwt,lwt.unix,cmdliner -libs okafka $(CFLAGS) $(TOOLS)
-
-issues: lwt
-	ocamlbuild -use-ocamlfind $(LWT_OPT) -pkgs lwt,lwt.unix,cmdliner -libs okafka $(CFLAGS) issue3.native
+	jbuilder uninstall
 
-tests: _build/tests.native
-	_build/tests.native
+test:
+	jbuilder runtest
 
 clean:
-	ocamlbuild -clean
+	jbuilder clean
 
-.PHONY: all clean tests install
+.PHONY: all clean test install uninstall