ref: gl: greatly improve VBO generating/uploading speed by simply reo… #2199

Job	Run time
Flatpak (su.xash.Engine.Compat.i386)	4m 47s
build (ubuntu-20.04, linux, amd64)	3m 10s
build (ubuntu-20.04, linux, i386)	3m 26s
build (ubuntu-20.04, android, multiarch)	7m 58s
build (ubuntu-latest, nswitch, arm64)	3m 56s
build (ubuntu-latest, psvita, armv7hf)	8m 32s
build (windows-latest, win32, amd64)	2m 9s
build (windows-2019, win32, i386)	2m 12s
Upload releases	31s
	36m 41s

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