Test bitstring macro evaluation.

For all bitstring macros, add a test with side effects in the
arguments. Also fix compiler warnings and wrap long line. In
main() replace exit(0) with return(0) to

Test bitstring macro evaluation.

For all bitstring macros, add a test with side effects in the
arguments. Also fix compiler warnings and wrap long line. In
main() replace exit(0) with return(0) to check stack canary. Create
expected test files with make target create-good.

OK florian deraadt@

show more ...

Rename a bunch of the old bsd.regress.mk variables into the new ones.

ok art@

trivial conversions to bsd.regress.mk

$OpenBSD$

initial import of NetBSD tree