* Update SBRP to get version with updated ilasm
Also, remove the prebuilts for packages that weren't being built
correctly.
* Add empty prebuilt directory
* Add some needed prebuilt packages to override temporarily bad ref packages.
* Remove bad ref packages.
* Also don't copy new versions of the bad SBRP packages after the SBRP build.
* Account for missing intermediate packages and different paths.
* Address code review comment.
* Initial checkin of source-build tarball build infra
* Add a couple more comments
* Update eng/SourceBuild.Version.Details.xml based on PR review
Co-authored-by: Chris Rummel <crummel@microsoft.com>
* Updates based on PR review comments
Co-authored-by: Chris Rummel <crummel@microsoft.com>