Bug#705592: 0ad: embedded copy of premake4 at build/premake/premake4

[Vincent Cheng]

I was mistaken in my earlier message about 0ad using premake 4.4
beta4; it looks like the situation is a bit more complex than that.
Currently, 0ad actually uses premake 4.3 with a bunch of custom
modifications on top of that [1][2], enough that upgrading to the
latest premake4 seems to be a hassle. We'll have to wait until
upstream 0ad finishes merging their changes with upstream premake
and/or drop their changes before we can use premake4 as-is in Debian
instead of the embedded copy.

Regards,
Vincent

[1] http://trac.wildfiregames.com/ticket/1938#comment:5
[2] http://trac.wildfiregames.com/ticket/1518