* elf/Makefile (tests): Add $(tests-vis-$(have-protected)).
(tests-vis-yes): Add vismain.
(modules-names): Add $(modules-vis-$(have-protected)).
(modules-vis-yes): Add vismod1, vismod2, and vismod3.
Add rules to generate and run vismain.
* elf/vismain.c: New file.
* elf/vismod1.c: New file.
* elf/vismod2.c: New file.
* elf/vismod3.c: New file.