git: include: Rewrite generation of <osreldate.h>

[Aaron LI]

commit 18323e1191feef830cb95b7d2f389e044a16ad66
Author: Aaron LI <aly at aaronly.me>
Date:   Sun Aug 2 11:51:50 2026 +0800

    include: Rewrite generation of <osreldate.h>
    
    * Add the new tools/gencopyright.sh script to generate the copyright
      header.  Prefer the copyright year extracted from top-level COPYRIGHT,
      similar to FreeBSD's.
    
    * Directly extract the __DragonFly_version from <sys/param.h> as RELDATE
      instead of calling newvers.sh.  As a result, no need to clean up the
      extra-generated files: version, vers.c and vers.txt.
    
    By the way, this also avoids a few bmake warnings appeared after the
    recent bmake upgrade (to 20260619):
    ```
    make[2]: warning: Invalid internal option "-J" in "/usr/src"; see the manual page
    make[2]: warning: Invalid internal option "-J" in "/usr/src"; see the manual page
    make[2]: warning: Invalid internal option "-J" in "/usr/src"; see the manual page
    make[5]: warning: Invalid internal option "-J" in "/usr/obj/usr/src/world_x86_64/usr/src/include"; see the manual page
    make[2]: warning: Invalid internal option "-J" in "/usr/src"; see the manual page
    make[2]: warning: Invalid internal option "-J" in "/usr/src"; see the manual page
    ```
    
    This warning is caused by the 'make -V KERN_IDENT' command in the
    newvers.sh script.

Summary of changes:
 include/Makefile      | 24 ++++++++++++------------
 tools/gencopyright.sh | 26 ++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 12 deletions(-)
 create mode 100755 tools/gencopyright.sh

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/18323e1191feef830cb95b7d2f389e044a16ad66


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