toolchain/59610: obsolete file check during release build blows up on case-insensitive host file systems

[thorpej%me.com@localhost]

>Number:         59610
>Category:       toolchain
>Synopsis:       obsolete file check during release build blows up on case-insensitive host file systems
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 27 15:50:00 +0000 2025
>Originator:     Jason Thorpe
>Release:        NetBSD 11.99.1
>Organization:
CISCy Business
>Environment:
Building NetBSD 11.99.1 as of "Wed Aug 27 08:42:01 PDT 2025" on macOS 15.4.1 host.
>Description:
At some point, some DES man pages were renamed, and the change varies only by case.  On a fresh "release" build from a host with a case-insensitive/case-preserving file system (e.g. macOS APFS), this causes the obsolete file check to remove the freshly-installed-with-new-name man pages, but subsequently blow up in the "checkflist" stage.

   === Removing obsolete files ===
Source directory: /Users/thorpej/NetBSD/current/src
Target directory: /opt/nbsd/current/destdir/virt68k/
obsolete fix:
	Removed obsolete file /opt/nbsd/current/destdir/virt68k//usr/share/man/man3/DES_random_key.3
	Removed obsolete file /opt/nbsd/current/destdir/virt68k//usr/share/man/html3/DES_random_key.html
postinstall fixes passed: obsolete
postinstall fixes failed:
   ===============================
.
.
.
   ===============================
checkflist ===> distrib/sets
    execute  checkflist

======  2 missing files in DESTDIR  ========
Files in flist but missing from DESTDIR.
File wasn't installed ?
------------------------------------------
./usr/share/man/html3/des_random_key.html
./usr/share/man/man3/des_random_key.3
========  end of 2 missing files  ==========

>How-To-Repeat:
Attempt to build a release (virt68k, in this case) on a macOS host.
>Fix:
The obsolete check probably should be smarter about deleting items.  A basic lookup of the file is insufficient -- the directory entry for the file should probably be examined and a case-sensitive verification of the file name performed.