make: Define program object deps as separate variable

Will need to extend it to support vdso-pie code which
used in both -- pie code and plain executable code.

I know it's ugly and I must invent some more elegant
way, but need some solution at moment to be able to
compile existing code.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile

@@ -142,7 +142,11 @@ pie: arch/$(ARCH)
 built-in.o: $(VERSION_HEADER) pie
 	$(Q) $(MAKE) $(build-crtools)=. $@
 
-$(PROGRAM): $(SYSCALL-LIB) $(ARCH-LIB) pie/util-net.o protobuf/built-in.o built-in.o
+PROGRAM-BUILTINS	+= pie/util-net.o
+PROGRAM-BUILTINS	+= protobuf/built-in.o
+PROGRAM-BUILTINS	+= built-in.o
+
+$(PROGRAM): $(SYSCALL-LIB) $(ARCH-LIB) $(PROGRAM-BUILTINS)
 	$(E) "  LINK    " $@
 	$(Q) $(CC) $(CFLAGS) $^ $(LIBS) -o $@