Don't recognize built-ins in contexts where they don't make sense.

Namely, it doesn't help to try and expand include if it's not followed
by parenthesis and a filename.

This should make applications like sendmail m4 scripts more sturdy for
unquoted machine names that happen to collide with built-ins.

The only drawback is that our m4 may now do intelligent things with scripts
that don't work on other systems.

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