Changed Makefiles so that the copying of files does not interfere with directories.

This means installations can be performed by non root users
(required for Linux From Scratch More Control Package Management hint)
added --no-overwrite-dir param to both files

Without this change the following error occurs on installation on default directory (executed as non root user):
*** install -d -m 755 /usr/share/locale
(cd po/build/locale && tar cf - .) | \
(cd '/usr/share/locale' && umask 022 && tar xof -)
tar: ./vi/LC_MESSAGES: Cannot utime: Operation not permitted
tar: ./vi/LC_MESSAGES: Cannot change mode to rwxr-xr-t: Operation not permitted
tar: ./vi: Cannot utime: Operation not permitted
tar: ./vi: Cannot change mode to rwxr-xr-t: Operation not permitted