[Swan-commit] Changes to ref refs/heads/main

[Andrew Cagney]

New commits:
commit 8a8623e287d00732af7117c22cdc787057f07538
Author: Andrew Cagney <cagney at gnu.org>
Date:   Wed Jun 8 15:17:42 2022 -0400

    building: overhaul linux.mk
    
    - set LINUX_VARIANT to /etc/os-release's ID+ID_LIKE
    
      For instance, on RHEL, ID=rhel and ID_LIKE=fedora.  This way a test
      for fedora in $(LINUX_VARIANT) works on RHEL.
    
      Ditto for debian and its derivatives ubuntu, mint, ...
    
    - drop old custom configs for fedora's 22, 28, 29, 30
    
    - drop old custom configs for debian/ubuntu's stretch, cosmic, xenial
    
      Debian's buster, and Ubuntu's focal and bionic remain.
    
    - add suse and arch
    
    - drop code detecting INITSYSTEM from /proc/1/comm
    
    - simplify code using $(wildcard) to detect files