Shuffle the Makefile up such that the `lib` target is the default

Makefile

@@ -5,13 +5,13 @@ GPRBUILD=gprbuild
 GPRCLEAN=gprclean
 TESTRUNNER=testrunner
 
+lib: pre
+	$(GPRBUILD) -p memcache.gpr
+
 pre:
 	mkdir -p build
 	mkdir -p obj
 
-lib: pre
-	$(GPRBUILD) -p memcache.gpr
-
 syntax: pre
 	gnatmake -gnatc -gnat05 -P memcache.gpr
 	gnatmake -gnatc -gnat05 -P memcachetest.gpr
@@ -32,3 +32,4 @@ clean: pre
 	rm -rf build ob
 	rm -f $(TESTRUNNER)
 	rm -f *.so*
+