Try to fix the windows build.

Author: cixtor

Makefile.in

@@ -431,12 +431,15 @@ rustllvm/rustllvmbits.a: $(RUSTLLVM_LIB_OBJS)
 	rm -f $@
 	ar crs $@ $^
 
+# Note: We pass $(CFG_LLVM_LIBS) twice to fix the windows link since
+# it has no -whole-archive.
 rustllvm/$(CFG_RUSTLLVM): rustllvm/rustllvmbits.a $(RUSTLLVM_OBJS_OBJS) \
                           $(MKFILES) $(RUSTLLVM_HDR) $(RUSTLLVM_DEF)
 	@$(call E, link: $@)
 	$(Q)$(call CFG_LINK_C,$@,$(RUSTLLVM_OBJS_OBJS) \
 	  $(CFG_GCC_PRE_LIB_FLAGS) $(CFG_LLVM_LIBS) \
           $(CFG_GCC_POST_LIB_FLAGS) rustllvm/rustllvmbits.a \
+	  $(CFG_LLVM_LIBS) \
           $(CFG_LLVM_LDFLAGS),$(RUSTLLVM_DEF))
 
 ifdef CFG_BOOT_NATIVE