Sandbox makefile: Added empty makefile for gawk.
Sandbox makefile: PATH is now exported to include installed bin globally.
Sandbox makefile: first pass at gawk. It, too, needs iconv.
Sandbox makefile: Added makefile for building gettext/iconv simultaneously.
Sandbox makefile: archives that do not sig have more meaningful error output.
Makefile sandbox: Missing keys now print properly again.
Sandbox makefile updates.

This is the first pass at gettext-iconv. However, it seems these do not build
correctly under cygwin, or I'm building them incorrectly. I'm committing to
try building them under an actual linux machine.