Support C-Style enum in preproc (#1984)

* [preproc] C-style enums

- asm files parseable from stdin
- 2nd preproc pass
- add parser for C-style `enum`
- positional arguments at end of command

---------

Co-authored-by: sbird <sbird@no.tld>
Co-authored-by: Martin Griffin <martinrgriffin@gmail.com>

tools/preproc/c_file.h

@@ -56,6 +56,4 @@ private:
     void RaiseWarning(const char* format, ...);
 };
 
-#define CHUNK_SIZE 4096
-
 #endif // C_FILE_H