ncurses: Fix case where ${B} != ${S}

This change allows ${B} != ${S} builds to work as otherwise
gnu-configize is executed in the incorrect directory.

(From OE-Core rev: 77d09b5ffd7867809004d7e3a6285e19087713b7)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/ncurses/ncurses.inc

@@ -94,7 +94,7 @@ do_configure() {
         # not the case for /dev/null redirections)
         export cf_cv_working_poll=yes
 
-	gnu-configize --force
+	( cd ${S}; gnu-configize --force )
 	ncurses_configure "narrowc" || \
 		return 1
 	! ${ENABLE_WIDEC} || \