add layout-qualifier to pc_fragColor in fragment shader program for webgl2 #22931
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Related issue: Fixed #22920, related #16390 (comment)
Description
layout(location = 0) out highp vec4 pc_fragColor
, layout qualifier is specificed in https://www.khronos.org/registry/OpenGL/specs/es/3.2/GLSL_ES_Specification_3.20.html#layout-qualifiers, and if use multiple render target, the location field must be declared.