Fix build.h dependencies

For Qt builds, the build.h file is moved to build/build.h. For regular
builds, it is moved to obj/build.h. This allows the Qt build to be done
in a different directory than the source, and without interfering with
other builds.

src/makefile.unix

@@ -6,7 +6,7 @@ USE_UPNP:=0
 
 DEFS=-DNOPCH
 
-DEFS += $(addprefix -I,$(CURDIR) $(BOOST_INCLUDE_PATH) $(BDB_INCLUDE_PATH) $(OPENSSL_INCLUDE_PATH))
+DEFS += $(addprefix -I,$(CURDIR) $(CURDIR)/obj $(BOOST_INCLUDE_PATH) $(BDB_INCLUDE_PATH) $(OPENSSL_INCLUDE_PATH))
 LIBS = $(addprefix -L,$(BOOST_LIB_PATH) $(BDB_LIB_PATH) $(OPENSSL_LIB_PATH))
 
 LMODE = dynamic
@@ -112,8 +112,9 @@ all: bitcoind
 -include obj/*.P
 -include obj-test/*.P
 
-build.h: FORCE
-	@../share/genbuild.sh build.h
+obj/build.h: FORCE
+	../share/genbuild.sh obj/build.h
+version.cpp: obj/build.h
 DEFS += -DHAVE_BUILD_INFO
 
 obj/%.o: %.cpp
@@ -123,7 +124,7 @@ obj/%.o: %.cpp
 	      -e '/^$$/ d' -e 's/$$/ :/' < $(@:%.o=%.d) >> $(@:%.o=%.P); \
 	  rm -f $(@:%.o=%.d)
 
-bitcoind: build.h $(OBJS:obj/%=obj/%)
+bitcoind: $(OBJS:obj/%=obj/%)
 	$(CXX) $(xCXXFLAGS) -o $@ $^ $(LDFLAGS) $(LIBS)
 
 TESTOBJS := $(patsubst test/%.cpp,obj-test/%.o,$(wildcard test/*.cpp))