Merge from amd64 branch:

Merge from amd64 branch:

44762 (sserapion)
[rbuild]
- Automatically generate reactos.dff using the installfile and installbase attributes found in rbuild files.
-- Fixes race to grab reactos.dff on concurrent builds in the same tree.
-- Makes the result of make install, make livecd and make bootcd the same(some modules arent in reactos.dff but have installfile/base attributes, which means they got intto livecd/install but not bootcd!)

44763 (sserapion)
[rbuild]
Really fix mkhive command.

44764 (sserapion)
[rbuild]
- fix mkhive command try 2.

svn path=/trunk/; revision=46452