Updated: setup (2.889)

[Jon Turney]

A new version of Setup, release 2.889, has been uploaded to

   https://cygwin.com/setup-x86.exe     (32 bit version)
   https://cygwin.com/setup-x86_64.exe  (64 bit version)

Changes compared to 2.888:
- Fix a crash which could occur with the --prune-install option
- Fix a bug which prevented the upgrade of an installed package which 
was (i) obsoleted, and also (ii) required by another installed packaged

Please send bug reports, as usual, to the public mailing list cygwin AT
cygwin DOT com.