gnucash stable: Multiple changes pushed

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/6eeb5c67 (commit)
	 via  https://github.com/Gnucash/gnucash/commit/ce59e6ea (commit)
	from  https://github.com/Gnucash/gnucash/commit/5911e8b2 (commit)



commit 6eeb5c67549a59f84fa54f26efbb84cbd0280cff
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Mar 28 15:10:24 2026 -0700

    Release GnuCash 5.15

commit ce59e6eab9acf33874c303c6eeb2f06f22d2a2b4
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Mar 28 15:05:36 2026 -0700

    Fix CI build failure on Arch Linux
    
    Boost is now separated into boost (headers) and boost-libs packages.



Summary of changes:
 CMakeLists.txt                            |   11 +-
 ChangeLog.2025                            | 1956 +++++++++++++++++++++++++++++
 NEWS                                      |   72 ++
 util/ci/actions/archlinux-test/Dockerfile |    2 +-
 4 files changed, 2037 insertions(+), 4 deletions(-)
 create mode 100644 ChangeLog.2025