tcl: disable 'zipfs' feature

tcl: disable 'zipfs' feature

zipfs is a new facility in tcl 9.x where various data files are bundled
into a zip archive, rather being separately installed.

Then that zip is embedded into libtcl.so from Makefile, thusly:

cat ${TCL_ZIP_FILE} >> ${LIB_FILE}

This is a major case of face meeting palm: any binary object
processing on the resulting .so file discards the extra data
at the end, and that's exactly what happens in do_package(),
resulting in a tcl installation without any language libraries.
This is not caught by ptest because it runs against a private
copy of the source tree.

Additionally, it helps to have data files on target systems
as files that can be viewed and edited.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Ross Burton <ross.burton@arm.com>