symbols.h: declare IVTYPE enum as separate type
symbols.h: declare IVTYPE enum as separate type

instead of declaring it in-line in the initval struct.

Signed-off-by: Matt Madison <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@madison.systems>

madisongh/blissc,madisongh/blissc,madisongh/blissc