os400: fix various ILE/RPG types definitions. Adjust build scripts.

    - A typo caused an undefined symbol reference.
    - A structure field name did not match the corresponding C name due to a typo.
    - Some structured fields were not properly aligned.
    - The long/ulong types were wrongly mapped to 64-bit types.
    - A typo in a /include directive caused a compilation error.
    - Doc files copy now converts from UTF-8 and split long lines.
    - Adjust /include file name mapping translation for proper prefix handling.