dev-util/spirv-headers: Drop old versions

Signed-off-by: Matt Turner <mattst88@gentoo.org>

dev-util/spirv-headers/Manifest

@@ -1,2 +1 @@
-DIST spirv-headers-1.4.304.0.tar.gz 532015 BLAKE2B c2b4fcc61c4d6c6134c19ddd31722fd2a87820621ce46fd8f5c810c53b0d671b40d4c5b2cef7ec54e273b17518778ea6059f5ff7f06049799457b8c4586a73ef SHA512 09d6a2e4f7758e8e6bd0c5036d8895befc96ea049b655d2786df4092a6f4ad4185a70ca83bd38683afb9b5e1ec45d8699a38d19774ca39c09f4f199fa1085946
 DIST spirv-headers-1.4.309.0.tar.gz 543165 BLAKE2B ae97940451da50812f2392bb4339374885b7686e7f3f48f49dbc720bbdb1f2d73bdf54dc3a612f41d86664693c754172d4d787eee4bb065f1c8192bf69485401 SHA512 545526940e5b42a53143732d6d00b61ee544f8137507f86b32230fb5110cf2cc8f3fc71d0b167e614ab2dd5faa1c4915965627146d519832d73f23ee6a2aa4bb

dev-util/spirv-headers/spirv-headers-1.4.304.0.ebuild

@@ -1,30 +0,0 @@
-# Copyright 1999-2025 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-MY_PN=SPIRV-Headers
-inherit cmake
-
-if [[ ${PV} == *9999* ]]; then
-	EGIT_REPO_URI="https://github.com/KhronosGroup/${MY_PN}.git"
-	inherit git-r3
-else
-	SRC_URI="https://github.com/KhronosGroup/${MY_PN}/archive/vulkan-sdk-${PV}.tar.gz -> ${P}.tar.gz"
-	KEYWORDS="amd64 arm arm64 ~loong ppc ppc64 ~riscv ~sparc x86"
-	S="${WORKDIR}"/${MY_PN}-vulkan-sdk-${PV}
-fi
-
-DESCRIPTION="Machine-readable files for the SPIR-V Registry"
-HOMEPAGE="https://registry.khronos.org/SPIR-V/ https://github.com/KhronosGroup/SPIRV-Headers"
-
-LICENSE="MIT"
-SLOT="0"
-
-src_configure() {
-	local mycmakeargs=(
-		-DSPIRV_HEADERS_ENABLE_TESTS=OFF
-		-DSPIRV_HEADERS_ENABLE_INSTALL=ON
-	)
-	cmake_src_configure
-}