fixup CC_FOR_BUILD conversion, another one

mk/kernel-vars.mk

@@ -5,16 +5,16 @@ KERNEL_MAKE_OPTS:=	V=1 \
 			ARCH="$(ADK_TARGET_KARCH)" \
 			CROSS_COMPILE="$(TARGET_CROSS)" \
 			CC="$(TARGET_CC)" \
-			HOSTCC="${CC_FOR_BUILD}" \
-			HOSTCXX="${CXX_FOR_BUILD}" \
+			HOSTCC="${HOST_CC}" \
+			HOSTCXX="${HOST_CXX}" \
 			DISABLE_PAX_PLUGINS=y \
 			CONFIG_SHELL='${SHELL}'
 
 # regex for relocs needs pcre on Darwin
 ifeq ($(ADK_HOST_DARWIN),y)
-KERNEL_MAKE_OPTS+=	HOSTCFLAGS='$(CPPFLAGS_FOR_BUILD) ${CFLAGS_FOR_BUILD}' HOSTLDFLAGS='-lpcreposix'
+KERNEL_MAKE_OPTS+=	HOSTCFLAGS='$(HOST_CPPFLAGS) ${HOST_CFLAGS}' HOSTLDFLAGS='-lpcreposix'
 else
-KERNEL_MAKE_OPTS+=	HOSTCFLAGS='${CFLAGS_FOR_BUILD}'
+KERNEL_MAKE_OPTS+=	HOSTCFLAGS='${HOST_CFLAGS}'
 endif
 
 KERNEL_MAKE_ENV:=	PATH="${STAGING_HOST_DIR}/usr/bin:$$PATH"