by default (new option "-H" will create the header only). Option "-c"
will clear the image.
* Adjusted build_haiku_image accordingly. vmdkimage is way faster and
more portable than the former vmdkheader+dd combo.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24784 a95241bf-73f2-0310-859d-f6bbb57e9c96