disable not available CFLAGS for h8300

Rules.mak

@@ -301,12 +301,14 @@ ifneq ($(TARGET_ARCH),bfin)
 ifneq ($(TARGET_ARCH),nios2)
 ifneq ($(TARGET_ARCH),sh)
 ifneq ($(TARGET_ARCH),c6x)
+ifneq ($(TARGET_ARCH),h8300)
 CPU_CFLAGS-y += -msoft-float
 endif
 endif
 endif
 endif
 endif
+endif
 
 $(eval $(call check-gcc-var,-std=gnu99))
 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)