media-libs/gl4es: Follow mesa and forge USE=egl

Signed-off-by: Haelwenn (lanodan) Monnier <contact@hacktivis.me>

media-libs/gl4es/gl4es-9999.ebuild

@@ -1,4 +1,4 @@
-# Copyright 2021 Gentoo Authors
+# Copyright 2021-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -10,11 +10,11 @@ HOMEPAGE="http://ptitseb.github.io/gl4es/"
 EGIT_REPO_URI="https://github.com/ptitSeb/gl4es.git"
 LICENSE="MIT"
 SLOT="0"
-IUSE="egl X test"
+IUSE="X test"
 RESTRICT="!test? ( test )"
 
 DEPEND="
-	media-libs/mesa[X?,egl?]
+	media-libs/mesa[X?,egl(+)]
 "
 RDEPEND="${DEPEND}"
 BDEPEND="test? ( dev-util/apitrace )"
@@ -24,7 +24,6 @@ BDEPEND="test? ( dev-util/apitrace )"
 src_configure() {
 	local mycmakeargs=(
 		-DNOX11=$(usex !X)
-		-DNOEGL=$(usex !egl)
 	)
 
 	cmake_src_configure

media-libs/gl4es/metadata.xml

@@ -5,9 +5,6 @@
 		<email>contact@hacktivis.me</email>
 		<name>Haelwenn (lanodan) Monnier</name>
 	</maintainer>
-	<use>
-		<flag name="egl">Enable EGL support.</flag>
-	</use>
 	<upstream>
 		<remote-id type="github">ptitSeb/gl4es</remote-id>
 	</upstream>