Consistent use of lex flags

[Dan McGregor]

Hi.

I was just noticing that mkcsmapper doesn't build with clang.  I saw two
ways to do this, the first being to #define YY_NO_INPUT, and the other to
use the %option noinput lex flag.

While there, I decided to explore and I changed a bunch of #defines to the
standard lex way of doing things.  I thought it would be good if all the
code that originated in FreeBSD could be consistent.

Thoughts?
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