l/cryptopp: Fixed misnamed variable.

l/cryptopp/cryptopp.SlackBuild

@@ -105,7 +105,7 @@ PACKAGING="
 chown root:root . -R
 /sbin/makepkg -l y -c n $OUT/$NAMEPKG-$VERSION-$ARCH-$BUILD.$EXT
 rm -rf $PKG
-rm -rf $TMP/$NAME
+rm -rf $TMP/$NAMESRC
 "
 if type -p fakeroot ; then
     echo "$PACKAGING" | fakeroot