Revert amtk patches
I tried to compile the current 3.30 release and was not able because amtk is set to 5.0 but is still 4.92 (somehow now i have the 5.0 version - nevermind)
I started to look over the source and don't see that much improvement to use this library and have the burden of a dependency and version juggling. I think, devhelp was fine with the standard way to declare a Shortcut-Window and add menus via GtkBuilder files.
Therefore i suggest: revert the amtk patches and drop the dependency to amtk.