Update gcc13 to version 13.4.0+git9739 / rev 36 via SR 1283431
    
    https://build.opensuse.org/request/show/1283431
    by user rguenther + anag_factory
    - Update to GCC 13.4 release
      * collects regression fixes from the last year
    - Remove hppa icecream backend to avoid conflicts with the
      hppa bootstrap compiler
    
    - Re-enable AutoReqProv for cross packages but filter files processed
      via __requires_exclude_from and __provides_exclude_from.
      [boo#1219031]
    - Exclude shared objects present for link editing in the GCC specific
      subdirectory from provides processing via __provides_exclude_from.
      [bsc#1244050][bsc#1243991]
    
    - Make cross-*-gcc13-bootstrap package conflict with the non-bootstrap
      variant conflict with the unversioned cross-*-gcc package.
    
    - Update to gcc-13 branch head, ec78a0d9962f144b13c6da3ebe, git9730
      * GCC 13.4 RC2
      * Includes gcc13-bsc1216664.patch