gdu-5.28.0-bp160.1.13

- Version 5.28.0
  * feat: delete/empty items in background by @dundee in #336
  * feat: add --show-item-count (-C) option by @ramgp in #332
  * feat: add --no-delete option by @ramgp in #333
  * feat: ignore item by pressing I by @dundee in #345
  * feat: delete directory items in parallel by @dundee in #340
  * feat: add --sequential option for sequential scanning by @dundee in #322

- Packaging improvements:
  * Drop autosetup -p 1 arg only needed when package has patches
  * Build PIE with pattern that may become recommended procedure:
    %%ifnarch ppc64 GOFLAGS="-buildmode=pie" %%endif go build
    A go toolchain buildmode default config would be preferable
    but none exist at this time.
  * Call go build with relative path to subdirectory containing
    func main()
  * Add basic %check to execute binary --help

- Initial package version 5.27.0