Added resize.c - a tool for setting up COLUMNS and ROWS

This is especially useful on embedded boards like the BeagleBoards
or gumstix when using a serial console. Then when you use vi, it
will know the actual size of the host window.

I got this copy from Paul Fox on the busybox mailing list.
http://lists.busybox.net/pipermail/busybox/2006-September/058676.html