Build 10212
GIT-
Linux build fix
SVN handles and Git names are merged into one person.
Linux build fix
add explicit "voidwrap" target to Makefile so I can "make voidwrap" and not "make voidwrap_steam_x64.dll", strip .dll after building, add UNREFERENCED_PARAMETER to DllMain() to silence warnings
It's nice that the Steam SDK was apparently updated to be compatible with MinGW at some point, so we aren't forced to build this .dll with MSVC anymore.
support setting and clearing "rich presence"