Add and use 'localedir' variable

This avoids the hardcoding of ${libdir}/locale which is all over the place,
and will facilitate use of ${exec_prefix}/lib/locale instead of
${libdir}/locale.

This doesn't actually change any output at this time. Verified this with
buildhistory against the packages produced from core-image-base.

(From OE-Core rev: b744f4cc2912334b8493a89525fd02af8e9b8edf)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/libc-common.bbclass

@@ -5,7 +5,7 @@ do_install() {
 		install -m 0644 ${S}/sunrpc/rpcsvc/$h ${D}/${includedir}/rpcsvc/
 	done
 	install -m 0644 ${WORKDIR}/etc/ld.so.conf ${D}/${sysconfdir}/
-	install -d ${D}${libdir}/locale
+	install -d ${D}${localedir}
 	make -f ${WORKDIR}/generate-supported.mk IN="${S}/localedata/SUPPORTED" OUT="${WORKDIR}/SUPPORTED"
 	# get rid of some broken files...
 	for i in ${GLIBC_BROKEN_LOCALES}; do