[openSUSE/obs-build] ae14c4: Remove weird DO_RPM_REMOVE variable

21 Dec 2022

      Branch: refs/heads/master
  Home:   https://github.com/openSUSE/obs-build
  Commit: ae14c43d0b4d1bdd6ece351329bb609672ac5d3f
      https://github.com/openSUSE/obs-build/commit/ae14c43d0b4d1bdd6ece351329bb609...
  Author: Michael Schroeder <mls@suse.de>
  Date:   2022-12-21 (Wed, 21 Dec 2022)

  Changed paths:
    M build

  Log Message:
  -----------
  Remove weird DO_RPM_REMOVE variable

It's unclear where it came from and it does not seem to be
in use anymore.