Building Qt writes many files into the source tree

When building Qt from the depot, many files are written into the source tree.

Most of the files written into the source tree are also written into the build tree, but the makefiles often refer to the files in the source tree.

This means if you tar up a build on one machine and move it to another identically set up machine with a clean Qt depot, `make' will always fail (because the makefiles refer to files in the depot which don't exist). This makes it difficult to, for example, reuse a single build to run autotests across multiple machines (which Qtopia QA wants to do).

Attached is a diff showing which files get added to the source tree during a build (default configuration).