mail-client/claws-mail: add dev-libs/libxml2 subslot op for incoming ABI break

Signed-off-by: Alfred Wingate <parona@protonmail.com>
Part-of: https://github.com/gentoo/gentoo/pull/41919
Signed-off-by: Sam James <sam@gentoo.org>

mail-client/claws-mail/claws-mail-3.21.0-r2.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -95,7 +95,7 @@ RDEPEND="${COMMONDEPEND}
 	pdf? ( app-text/ghostscript-gpl )
 	perl? ( dev-lang/perl:= )
 	rss? (
-		dev-libs/libxml2
+		dev-libs/libxml2:=
 		net-misc/curl
 	)
 "

mail-client/claws-mail/claws-mail-4.3.0-r3.ebuild

@@ -82,7 +82,7 @@ COMMONDEPEND="
 		')
 	)
 	rss? (
-		dev-libs/libxml2
+		dev-libs/libxml2:=
 		net-misc/curl
 	)
 	session? (

mail-client/claws-mail/claws-mail-4.3.1-r1.ebuild

@@ -85,7 +85,7 @@ COMMONDEPEND="
 		')
 	)
 	rss? (
-		dev-libs/libxml2
+		dev-libs/libxml2:=
 		net-misc/curl
 	)
 	session? (

mail-client/claws-mail/claws-mail-9999.ebuild

@@ -85,7 +85,7 @@ COMMONDEPEND="
 		')
 	)
 	rss? (
-		dev-libs/libxml2
+		dev-libs/libxml2:=
 		net-misc/curl
 	)
 	session? (