external-arm-toolchain: in libc.so GNU ld script use base_libdir

`base_libdir` gets replaced with `/lib` or `/usr/lib` depending on
`usrmerge` distro feature.

(cherry picked from commit 4b2cef379f94026d275e8455d1da17c29c8f9042)

Signed-off-by: Vasyl Vavrychuk <vvavrychuk@gmail.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Acked-by: Denys Dmytriyenko <denys@konsulko.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-toolchain/recipes-devtools/external-arm-toolchain/external-arm-toolchain.bb

@@ -224,9 +224,9 @@ do_install() {
 	rm -rf ${D}${includedir}/rpcsvc/rquota.*
 
 	if [ -f ${D}${libdir}/libc.so ];then
-		sed -i -e "s# /usr/${EAT_LIBDIR}/# /usr/lib/#g" -e "s# /${EAT_LIBDIR}/ld-linux# ../../${EAT_LIBDIR}/ld-linux#g" ${D}${libdir}/libc.so
+		sed -i -e "s# /usr/${EAT_LIBDIR}/# /usr/lib/#g" -e "s# /${EAT_LIBDIR}/ld-linux# ../../${base_libdir}/ld-linux#g" ${D}${libdir}/libc.so
 		sed -i -e "s# /${EAT_LIBDIR}/libc.so.6# /lib/libc.so.6#g" ${D}${libdir}/libc.so
-		sed -i -e "s# /lib# ../../lib#g" -e "s# /usr/lib# .#g" ${D}${libdir}/libc.so
+		sed -i -e "s# /lib# ../../${base_libdir}#g" -e "s# /usr/lib# .#g" ${D}${libdir}/libc.so
 	fi
 
 	if [ -f ${D}${base_libdir}/libc.so ];then