dev-cpp/simdutf: retire the atomic-base64 use flag

instead always set -DSIMDUTF_CXX_STANDARD=20 which is required by e.g.
nodejs.

Bug: https://bugs.gentoo.org/984708
Bug: https://bugs.gentoo.org/984872
See: f282cd83ee
Signed-off-by: Lukas Schmelting <lschmelting@posteo.com>
Part-of: https://codeberg.org/gentoo/gentoo/pulls/2158
Signed-off-by: Sam James <sam@gentoo.org>

dev-cpp/simdutf/metadata.xml

@@ -5,9 +5,6 @@
     <email>gnome@gentoo.org</email>
     <name>Gentoo GNOME Desktop</name>
   </maintainer>
-  <use>
-        <flag name="atomic-base64">Enable atomic base64 calls</flag>
-  </use>
   <upstream>
     <remote-id type="github">simdutf/simdutf</remote-id>
   </upstream>

dev-cpp/simdutf/simdutf-9.2.1.ebuild

@@ -6,7 +6,7 @@ EAPI=8
 DOCS_BUILDER="doxygen"
 DOCS_DIR=""
 
-PYTHON_COMPAT=( python3_{12..14} )
+PYTHON_COMPAT=( python3_{12..15} )
 
 inherit cmake docs python-any-r1
 
@@ -17,7 +17,7 @@ SRC_URI="https://github.com/${PN}/${PN}/archive/refs/tags/v${PV}.tar.gz -> ${P}.
 LICENSE="|| ( Apache-2.0 MIT )"
 SLOT="0/36"
 KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~sparc ~x86"
-IUSE="atomic-base64 test"
+IUSE="test"
 RESTRICT="!test? ( test )"
 
 RDEPEND="
@@ -37,14 +37,9 @@ src_configure() {
 	local mycmakeargs+=(
 		-DSIMDUTF_TESTS=$(usex test)
 		-DSIMDUTF_ATOMIC_BASE64_TESTS=$(usex test)
+		-DSIMDUTF_CXX_STANDARD=20
 	)
 
-	if use atomic-base64; then
-		mycmakeargs+=(
-			-DSIMDUTF_CXX_STANDARD=20
-		)
-	fi
-
 	cmake_src_configure
 }