Adjust testgl.c to test gl_release_behavior #287

Job	Run time
Create test plan	7s
level1 / Haiku	1m 50s
level2 / NetBSD	2m 56s
level2 / Ubuntu 20.04	5m 52s
level2 / MacOS (GNU prefix)	3m 16s
level2 / Windows (MSVC, ARM)	4m 18s
level2 / Emscripten	9m 0s
level2 / Windows (msys2, clang64)	6m 6s
level2 / Windows (msys2, mingw32)	9m 4s
level2 / Android (CMake)	3m 1s
level2 / PowerPC	1m 46s
level2 / Steam Linux Runtime (Sniper)	4m 12s
level2 / MacOS (Framework) (x64)	7m 56s
level2 / Windows (MSVC, clang-cl x64)	6m 24s
level2 / Nintendo 3DS	1m 54s
level2 / Windows (MSVC, clang-cl x86)	4m 39s
level2 / Windows (MSVC, x64)	5m 54s
level2 / GDK (MSVC, x64)	3m 9s
level2 / Ubuntu 22.04	4m 22s
level2 / Sony PlayStation Vita (GLES w/ pib)	3m 8s
level2 / Windows (msys2, mingw64)	8m 23s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	1m 27s
level2 / RISC OS	1m 15s
level2 / Windows (msys2, ucrt64)	8m 30s
level2 / tvOS (CMake & xcode)	1m 46s
level2 / Android (Android.mk)	1m 8s
level2 / Android (Gradle)	2m 20s
level2 / Windows (msys2, clang32)	7m 38s
level2 / Windows (MSVC, x86)	5m 50s
level2 / FreeBSD	2m 39s
level2 / Sony PlayStation 2	4m 46s
level2 / Ubuntu 20.04 (Intel oneAPI)	8m 0s
level2 / iOS (CMake & xcode)	1m 1s
level2 / Ubuntu 20.04 (Intel Compiler)	5m 27s
level2 / MacOS (Framework) (arm64)	2m 22s
level2 / Android (CMake, lean)	3m 7s
level2 / LoongArch64	2m 51s
level2 / Windows (MSVC, ARM64)	4m 38s
level2 / Sony PlayStation Portable	3m 40s
level2 / PowerPC64	1m 45s
	2h 47m 27s

Provide feedback