www-client/firefox: re-enable USE=pgo for USE=wayland

Forcing GDK_BACKEND=x11 during build should be enough.

Package-Manager: Portage-2.3.71, Repoman-2.3.17
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

www-client/firefox/firefox-68.0.2.ebuild

@@ -169,10 +169,7 @@ DEPEND="${CDEPEND}
 
 # We use virtx eclass which cannot handle wayland
 REQUIRED_USE="wifi? ( dbus )
-	pgo? (
-		lto
-		!wayland
-	)"
+	pgo? ( lto )"
 
 S="${WORKDIR}/firefox-${PV%_*}"
 
@@ -259,7 +256,6 @@ src_unpack() {
 }
 
 src_prepare() {
-	use !wayland && rm -f "${WORKDIR}/firefox/2019_mozilla-bug1539471.patch"
 	eapply "${WORKDIR}/firefox"
 
 	# Allow user to apply any additional patches without modifing ebuild
@@ -586,8 +582,13 @@ src_compile() {
 		addpredict /etc/gconf
 	fi
 
-	MOZ_MAKE_FLAGS="${MAKEOPTS} -O" SHELL="${SHELL:-${EPREFIX}/bin/bash}" MOZ_NOSPAM=1 ${_virtx} \
-	./mach build --verbose || die
+	GDK_BACKEND=x11 \
+		MOZ_MAKE_FLAGS="${MAKEOPTS} -O" \
+		SHELL="${SHELL:-${EPREFIX}/bin/bash}" \
+		MOZ_NOSPAM=1 \
+		${_virtx} \
+		./mach build --verbose \
+		|| die
 }
 
 src_install() {