o Remove header files, which are handled by xorg-libs.
o Don't leave empty version.def, it's needed for some packages
(e.g Xft2/builtin.mk, Xrandr/builtin.mk, etc).
o Remove duplicated line in do-build target.
Bump PKGREVISION.
The xorg-imake package provides various utilities, such as imake, lndir,
mkdirhier, xmkmf, and others. These utilities are from X.org, although
an X server and X libraries are not needed.