remove all traces of some files

[Eric Frederich <eric.frederich@gmail.com>]

I have been adding build files (.dll and .so files) to my git
repository periodically when I have been doing builds of my project.
I know I shouldn't be doing this and want to set up some other kind of
separate archive or something for built files.

Although there are other devs on the project, I am the only one using
Git.  Everyone else uses AccuRev.
Personally, I maintain my own Git repo (with an AccuRev git branch).

I would like to remove all traces of those .dll and .so files if I
could in my git repository.
I realize this would mess with hashes and would ultimately result in a
completely new tree.
I am fine with that since, as I said, I am the only user of this Git repo.

So, can this be done?  Can I rebuild the tree preserving commit
messages, timestamps, etc but ignoring certain files?

Thanks,
~Eric