arb_shader_image_load_store: Make sure to only call supported indirect function
As we are using glMultiDrawArraysIndirect, we need to ensure that GL_ARB_multi_draw_indirect is available and not only GL_ARB_draw_indirect.
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As we are using glMultiDrawArraysIndirect, we need to ensure that GL_ARB_multi_draw_indirect is available and not only GL_ARB_draw_indirect.