Make relibc-tests easy to run on Redox
- fix a bug in cbindgen header building so it stops on first error
- change relibc-tests program so it can handle status-only results (no output checking) by prefixing
-sto the front of the program name, e.g.bins_verify/relibc-tests -spwd - add a script to run all tests on Redox (I couldn't find a way to share one list of tests between both the Makefile and the shell script)