tweak the makefiles to ensure that libmarkdown (a synthetic target) is make before any of the executables are assembled during a parallel make

Makefile.in

@@ -127,9 +127,12 @@ gethopt.o: gethopt.c
 main.o: main.c mkdio.h config.h
 	$(BUILD) -c main.c
 
-$(MKDLIB): $(OBJS)
+$(MKDLIB): $(OBJS) .libmarkdown
 	./librarian.sh make $(MKDLIB) VERSION $(OBJS)
 
+.libmarkdown: $(OBJS)
+	touch $@
+
 verify: echo tools/checkbits.sh verify_subdirs
 	@./echo -n "headers ... "; tools/checkbits.sh && echo "GOOD"
 

tests/exercisers/make.include

@@ -4,7 +4,7 @@ EXERCISE=$(exercisers)/flags
 
 TESTFRAMEWORK += $(EXERCISE)
 
-$(exercisers)/flags: $(exercisers)/flags.o
+$(exercisers)/flags: $(exercisers)/flags.o $(MKDLIB)
 	$(LINK) -o $@ $< -lmarkdown
 	
 $(exercisers)/flags.o: $(exercisers)/flags.c