Rollup: Added constant SRGB8.

utils/build/rollup.config.js

@@ -159,6 +159,7 @@ export function glconstants() {
 		READ_FRAMEBUFFER: 36008,
 		DRAW_FRAMEBUFFER: 36009,
 		SAMPLE_ALPHA_TO_COVERAGE: 32926,
+		SRGB8: 35905,
 		SRGB8_ALPHA8: 35907
 	};