build: split the non-gui startup routines into a new file

This will allow each to have its own main(), meaning that we can build a common
base client and simply link in the correct startup object to create the
appropriate binary.

src/makefile.unix

@@ -121,6 +121,7 @@ OBJS= \
     obj/key.o \
     obj/db.o \
     obj/init.o \
+    obj/bitcoind.o \
     obj/keystore.o \
     obj/main.o \
     obj/net.o \
@@ -187,7 +188,7 @@ obj-test/%.o: test/%.cpp
 	      -e '/^$$/ d' -e 's/$$/ :/' < $(@:%.o=%.d) >> $(@:%.o=%.P); \
 	  rm -f $(@:%.o=%.d)
 
-test_bitcoin: $(TESTOBJS) $(filter-out obj/init.o,$(OBJS:obj/%=obj/%))
+test_bitcoin: $(TESTOBJS) $(filter-out obj/init.o obj/bitcoind.o,$(OBJS:obj/%=obj/%))
 	$(LINK) $(xCXXFLAGS) -o $@ $(LIBPATHS) $^ $(TESTLIBS) $(xLDFLAGS) $(LIBS)
 
 clean: