Rename src/obj/test to src/obj-test to workaround bug in older GNU Make

src/makefile.unix

@@ -111,7 +111,7 @@ all: bitcoind
 
 # auto-generated dependencies:
 -include obj/*.P
--include obj/test/*.P
+-include obj-test/*.P
 
 obj/%.o: %.cpp
 	$(CXX) -c $(xCXXFLAGS) -MMD -o $@ $<
@@ -123,9 +123,9 @@ obj/%.o: %.cpp
 bitcoind: $(OBJS:obj/%=obj/%)
 	$(CXX) $(xCXXFLAGS) -o $@ $^ $(LDFLAGS) $(LIBS)
 
-TESTOBJS := $(patsubst test/%.cpp,obj/test/%.o,$(wildcard test/*.cpp))
+TESTOBJS := $(patsubst test/%.cpp,obj-test/%.o,$(wildcard test/*.cpp))
 
-obj/test/%.o: test/%.cpp
+obj-test/%.o: test/%.cpp
 	$(CXX) -c $(TESTDEFS) $(xCXXFLAGS) -MMD -o $@ $<
 	@cp $(@:%.o=%.d) $(@:%.o=%.P); \
 	  sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
@@ -138,6 +138,6 @@ test_bitcoin: $(TESTOBJS) $(filter-out obj/init.o,$(OBJS:obj/%=obj/%))
 clean:
 	-rm -f bitcoind test_bitcoin
 	-rm -f obj/*.o
-	-rm -f obj/test/*.o
+	-rm -f obj-test/*.o
 	-rm -f obj/*.P
-	-rm -f obj/test/*.P
+	-rm -f obj-test/*.P

src/obj-test/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore