firmware: start phasing out LibreSSL glue

No longer able to select it from the GUI.  CORE_FLAVOUR
still exists but can be removed safely later on.

Makefile

@@ -1,4 +1,4 @@
-# Copyright (c) 2014-2022 Franco Fichtner <franco@opnsense.org>
+# Copyright (c) 2014-2023 Franco Fichtner <franco@opnsense.org>
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -109,8 +109,6 @@ CORE_PYTHON_DOT=	${CORE_PYTHON:C/./&./1}
 
 .if "${CORE_FLAVOUR}" == OpenSSL
 CORE_REPOSITORY?=	${CORE_ABI}/latest
-.elif "${CORE_FLAVOUR}" == LibreSSL
-CORE_REPOSITORY?=	${CORE_ABI}/libressl
 .else
 CORE_REPOSITORY?=	unsupported/${CORE_FLAVOUR:tl}
 .endif

README.md

@@ -66,7 +66,6 @@ Several OPTIONS exist to customise the package, e.g.:
 * CORE_DEPENDS: a list of required dependencies for the package
 * CORE_DEPENDS_ARCH: a list of special <ARCH>-required packages
 * CORE_ORIGIN: sets a FreeBSD compatible package/ports origin
-* CORE_FLAVOUR: can be set to "OpenSSL" or "LibreSSL"
 * CORE_COMMENT: a short description of the package
 * CORE_MAINTAINER: email of the package maintainer
 * CORE_WWW: web url of the package

src/opnsense/mvc/app/controllers/OPNsense/Core/Api/repositories/opnsense.xml

@@ -102,10 +102,6 @@
             <name/>
             <description>(default)</description>
         </flavour>
-        <flavour>
-            <name>libressl</name>
-            <description>LibreSSL</description>
-        </flavour>
         <flavour has_subscription="true">
             <name>latest</name>
             <description>OpenSSL</description>