container-diff-0.9.0-bp150.2.6

- Build container-diff as PIC (via `-buildmode=pie`).
- Exclude ppc64le from tests.

- Update container-diff to v0.9.0:
  * Add metadata diffing
  * Sanitize filepaths before joining to prevent filepath traversal
  * Fix appending of latest tag to tar files
  * Correctly clean up image filesystems
  * Set/unset write bit when unpacking directories out of permission scope
  * Add all docker config fields to image config
  * Sort maps before diffing to prevent flaky results
  * Correctly handle case where no image source is parsed
  * Cleanup image source directory

- Update container-diff to v0.8.0:
  * Fixed issue where remote:// prefix was not being stripped correctly
  * Allow updating env vars on MutableSource image
  * Save temp layers in cache directory instead of /tmp
  * Allow accessing and modifying MutableSource config
  * Fixed appending latest tag to images with no tag provided
  * Created default ImageSource if none is provided to prepper

- Cleanup spec file with spec-cleaner.
- Use golang-package macro to strip binaries.
- Update container-diff to v0.7.0:
  * Download remote:// images in RPMAnalyzer
  * Add support for custom formatting strings
  * Refactors to the cache and image unpacking code
  * Add Label to ConfigObject
  * Add MutableSource for basic image modifications

- Add container-diff v0.6.2: container-diff is a tool to analyze and diff
  container images.