config: add functional 26.7 / 15.1
* Rebase for 15.1-RC3, volatile/26.7 for now
* OpenSSL 3.5 with FIPS, ports-only for now
* plugins and core as -devel only for now
* SMP configs adjusted for stale options
* Removed ndproxy
* PHP 8.5
To review:
# diff -ur config/26.1 config/26.7
config: fix zabbix builds after option change
===> License GPLv2+ accepted by the user
====> You must select one and only one option from the DB single
=====> Only one of these must be defined: MYSQLDV SQLITE
*** Error code 1
composite: move "factory" target to custom script
It's mostly the same and the indirection through custom
is annoying to work with. Since it is just a helper for
the VM image type don't document it further.