add CPU_FLAGS for target to TARGET_LDFLAGS, required for h8300

mk/vars.mk

@@ -148,6 +148,7 @@ endif
 ifneq ($(ADK_TARGET_CPU_FLAGS),)
 TARGET_CFLAGS+=		$(ADK_TARGET_CPU_FLAGS)
 TARGET_CXXFLAGS+=	$(ADK_TARGET_CPU_FLAGS)
+TARGET_LDFLAGS+=	$(ADK_TARGET_CPU_FLAGS)
 endif
 
 ifneq ($(ADK_TARGET_FPU),)