autodetect host/build system

toolchain/binutils/Makefile

@@ -25,8 +25,6 @@ $(WRKBUILD)/.configured:
 	(cd $(WRKBUILD); \
 		$(WRKBUILD)/configure \
 		--prefix=$(STAGING_HOST_DIR) \
-		--build=$(GNU_HOST_NAME) \
-		--host=$(GNU_HOST_NAME) \
 		--target=$(REAL_GNU_TARGET_NAME) \
 		--with-sysroot=$(STAGING_TARGET_DIR) \
 		--disable-multilib \