render: Make fix-shaders.sh work with GNU sed #8

Job	Run time
Create test plan	4s
level1 / Haiku	1m 40s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	3m 6s
level2 / Sony PlayStation 2	4m 30s
level2 / Windows (MSVC, x86)	3m 57s
level2 / Android (Android.mk)	4m 37s
level2 / NetBSD	2m 29s
level2 / Windows (MSVC, ARM)	2m 18s
level2 / Sony PlayStation Portable	3m 28s
level2 / FreeBSD	2m 43s
level2 / Windows (MSVC, clang-cl x64)	3m 33s
level2 / Android (Gradle)	2m 1s
level2 / Nintendo 3DS	1m 50s
level2 / Sony PlayStation Vita (GLES w/ pib)	3m 0s
level2 / Android (CMake)	4m 4s
level2 / Windows (msys2, clang64)	5m 39s
level2 / GDK (MSVC, x64)	3m 40s
level2 / Windows (MSVC, x64)	4m 40s
level2 / Emscripten	8m 18s
level2 / Windows (msys2, ucrt64)	8m 40s
level2 / Windows (msys2, clang32)	6m 54s
level2 / Ubuntu 20.04 (Intel oneAPI)	6m 13s
level2 / MacOS (Framework) (x64)	4m 1s
level2 / Android (CMake, lean)	3m 57s
level2 / Ubuntu 20.04 (Intel Compiler)	4m 41s
level2 / PowerPC64	1m 51s
level2 / iOS (CMake & xcode)	2m 4s
level2 / RISC OS	1m 21s
level2 / Windows (msys2, mingw64)	8m 4s
level2 / MacOS (Framework) (arm64)	3m 9s
level2 / Ubuntu 22.04	4m 32s
level2 / LoongArch64	2m 54s
level2 / tvOS (CMake & xcode)	2m 8s
level2 / Ubuntu 20.04	4m 11s
level2 / Windows (MSVC, clang-cl x86)	4m 58s
level2 / Windows (MSVC, ARM64)	3m 7s
level2 / Windows (msys2, mingw32)	8m 4s
level2 / MacOS (GNU prefix)	3m 3s
	2h 29m 29s

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