toolchain/helpers.mk: use --chmod on rsync

This makes sure we don't have any weird permissions on the staging dir,
which could affect the target.

Signed-off-by: Guido Martínez <guido@vanguardiasur.com.ar>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

toolchain/helpers.mk

@@ -139,7 +139,7 @@ copy_toolchain_sysroot = \
 	SUPPORT_LIB_DIR="$(strip $5)" ; \
 	for i in etc $${ARCH_LIB_DIR} sbin usr usr/$${ARCH_LIB_DIR}; do \
 		if [ -d $${ARCH_SYSROOT_DIR}/$$i ] ; then \
-			rsync -au --chmod=Du+w --exclude 'usr/lib/locale' \
+			rsync -au --chmod=u=rwX,go=rX --exclude 'usr/lib/locale' \
 				--exclude lib --exclude lib32 --exclude lib64 \
 				$${ARCH_SYSROOT_DIR}/$$i/ $(STAGING_DIR)/$$i/ ; \
 		fi ; \