perl: add @STAGINGDIR@ for config.sh substitions

For some config.sh substitions, we'd like to be able to use
STAGING_DIR_HOST; add @STAGINGDIR@ to allow for that.

(From OE-Core rev: cc594be0877b2a6616453c402db0a58ef265bc8d)

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/perl/perl_5.14.2.bb

@@ -147,6 +147,7 @@ do_configure() {
         sed -i -e 's,@DESTDIR@,${prefix},g' \
                -e 's,@ARCH@-thread-multi,,g' \
                -e 's,@ARCH@,${TARGET_ARCH}-${TARGET_OS},g' \
+               -e 's,@STAGINGDIR@,${STAGING_DIR_HOST},g' \
                -e "s%/usr/include%${STAGING_INCDIR}%g" \
 	       -e 's,/usr/lib/,${libdir}/,g' \
 	       -e 's,/usr/,${exec_prefix}/,g' \