app-emulation/libvirt: Drop workarounds for CONFIG_CHECK for old kernels

Some kernel config options are renamed and to allow users to run
libvirt on older kernels we had to check kernel version and
either include old or new name in CONFIG_CHECK.

Well, I think it is safe to assume nobody runs the most recent
libvirt on 4.X or <5.2 kernels and thus these workarounds can be
dropped.

Just to be on the safe side, let's make the change only for the
live ebuild for now.

Signed-off-by: Michal Privoznik <michal.privoznik@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/40566
Signed-off-by: Sam James <sam@gentoo.org>

app-emulation/libvirt/libvirt-9999.ebuild

@@ -205,9 +205,6 @@ pkg_setup() {
 		~!GRKERNSEC_CHROOT_CHMOD
 		~!GRKERNSEC_CHROOT_CAPS"
 
-	kernel_is lt 4 7 && use lxc && CONFIG_CHECK+="
-		~DEVPTS_MULTIPLE_INSTANCES"
-
 	use virt-network && CONFIG_CHECK+="
 		~BRIDGE_EBT_MARK_T
 		~BRIDGE_NF_EBTABLES
@@ -215,6 +212,7 @@ pkg_setup() {
 		~NETFILTER_XT_CONNMARK
 		~NETFILTER_XT_MARK
 		~NETFILTER_XT_TARGET_CHECKSUM
+		~NETFILTER_XT_TARGET_MASQUERADE
 		~NET_ACT_CSUM
 		~IP_NF_FILTER
 		~IP_NF_MANGLE
@@ -223,17 +221,6 @@ pkg_setup() {
 		~IP6_NF_MANGLE
 		~IP6_NF_NAT"
 
-	# This was renamed in kernel commit v5.2-rc1~133^2~174^2~6
-	if use virt-network ; then
-		if kernel_is -lt 5 2 ; then
-			CONFIG_CHECK+="
-			~IP_NF_TARGET_MASQUERADE"
-		else
-			CONFIG_CHECK+="
-			~NETFILTER_XT_TARGET_MASQUERADE"
-		fi
-	fi
-
 	# Bandwidth Limiting Support
 	use virt-network && CONFIG_CHECK+="
 		~BRIDGE_EBT_T_NAT