Maki ignores whitespace in emitted macro definition bodies

[PappasBrent]

Currently, when Maki emits the definition for a macro body, it does not preserve the original definition's whitespace.
This causes Maki to emit broken definitions for macros whose replacement lists contain type casts, e.g. for the following macro

#define CAST(c) ((unsigned int)(unsigned char)c)

Maki would emit this definition:

((unsignedint)(unsignedchar)c)

Maki should respect the original macro definition's whitespace.