Add three more tests cases recently added to the take-2 branch.

Add three more tests cases recently added to the take-2 branch.

The 071-punctuator test is failing only trivially (whitespace change only).

And the 072-token-pasting-same-line.c test passes just fine here, (more
evidence perhaps that the approach in take-2 is more trouble than it's
worth?).

The 099-c99-example test case is the inspiration for much of the rest
of the test suite. It amazingly passes on the take-2 branch, but
doesn't pass here yet.