There were few things that prevented successful compilation
using c89 standard. (and other c* standards in case of gcc).
Fix them in this small patch.
Changes in 27/rand.c:
- Use __GNU_SOURCE__ instead of __GNU_LIBRARY__
or else any of -std=c* options don't work with gcc
- Add a check before using rand_r() as suggested in rand_r(3)
- Move _WIN_32 definitions to "else" branch because it uses the most portable version
By convention, a library meant for testing exports "run-tests".
Also by convention, assume the test for (foo bar) is (foo bar-test),
keeping the test in the same directory and avoiding confusion since
(chibi test) is not a test for (chibi).
- Avoids the hack of "load"ing test, with resulting namespace complications.
- Allows keeping tests together with the libraries.
- Allows setting up test hooks before running.
- Allows implicit inference of test locations when using above conventions.
