binutils: harden installation permissions

Compilers and related utils are better restricted on production platforms.
Change permissions of all installed binutils tools to remove access from
users outside of the root group.

Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>

meta-ohos-staging/recipes-devtools/binutils/binutils_2.37.bb

@@ -54,6 +54,10 @@ do_install_class-native () {
 	rmdir ${D}/${libdir}64 || :
 }
 
+do_install_append_class-target () {
+	chmod o-rx ${D}${prefix}/${TARGET_SYS}/bin/*
+}
+
 # libctf races with libbfd
 PARALLEL_MAKEINST_class-target = ""
 PARALLEL_MAKEINST_class-nativesdk = ""