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@

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Putting Xs into squares is all the rage with statisticians. We should
test that they can use bitstring macros for that.

with & OK deraadt
OK bluhm