net-wireless/wpa_supplicant: allow privsep only without macsec

According to upstream, it's not a valid combination, when you do enable
macsec and privsep together.

Upstream says:
CONFIG_PRIVSEP=y does not have sufficient support for the new driver
interface functions used for MACsec, so this combination cannot be used
at least for now.

Closes: https://bugs.gentoo.org/684442
Package-Manager: Portage-2.3.67, Repoman-2.3.13
Signed-off-by: Conrad Kostecki <conrad@kostecki.com>

net-wireless/wpa_supplicant/wpa_supplicant-2.8.ebuild

@@ -19,6 +19,7 @@ fi
 
 SLOT="0"
 IUSE="ap bindist dbus eap-sim eapol_test fasteap +fils +hs2-0 libressl macsec p2p privsep ps3 qt5 readline selinux smartcard tdls uncommon-eap-types wimax wps kernel_linux kernel_FreeBSD"
+REQUIRED_USE="privsep? ( !macsec )"
 
 CDEPEND="dbus? ( sys-apps/dbus )
 	kernel_linux? (