Mario Haustein

add missing header

add missing header

After rebasing I learnt you already had cherry-picked my commits during February after the discussion in https://sourceforge.net/p/mcj/fig2dev/merge-requests/1/. So this merge request if effectively empty. Sorry for the noise.

Fix prototypes for modern C

Sorry, no intention to threat anyone. How far did you proceed? I should add that I also had done some work on function casts, yet unpublished. Unpublished, because it clutters development history, and I wanted to insert such stuff at the end of a release cycle. If you did not yet advance too far, I should bring that code into a decent shape and publish it as a separate branch. Otherwise, I am happy to merge your work. I pushed my current work under https://sourceforge.net/u/hamarituc/xfig/ci/prototypes/tree/...

Fix miscellaneous prototypes

Fix X callback prototypes

Fix prototypes for manipulation callbacks