Emit #line more eagerly

Emit #line more eagerly

empty text chunklets after a newline were being treated as a
valid reason not to emit a #line pragma

This was needlessly causing #line to be emitted in the middle
of multiline #defines at the top of an included chunk or in the
middle of a function parameter list.

This fix doesn't prevent such bad behaviour (which depends on
mode tracking) but it does prevent it occuring needlessly