The canonical spelling of a #define line glued a '(' to the macro name
whatever the input's spacing, turning an object macro whose body opens
with a parenthesis into a parameterised one, and it flattened the
backslash continuations of a multi-line body into one physical line,
fusing the statements the expansion splits at those boundaries. Both
change what a valid file assembles to, so renderPreproc now keeps the
name's adjacency (the same column check the preprocessor applies) and
restores the continuation boundaries from the token positions.
Assisted-by: GLM 5.3
