shader: require GL_OES_texture_storage_multisample_2d_array for 2D MS.

This fix all dEQP-GLES31.functional.shaders.builtin_functions.* tests on GLES

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
Reviewed-By: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/vrend_shader.c

@@ -3941,6 +3941,8 @@ static char *emit_header(struct dump_ctx *ctx, char *glsl_hdr)
 {
    if (ctx->cfg->use_gles) {
       STRCAT_WITH_RET(glsl_hdr, "#version 300 es\n");
+      if (ctx->shader_req_bits & SHADER_REQ_SAMPLER_MS)
+         STRCAT_WITH_RET(glsl_hdr, "#extension GL_OES_texture_storage_multisample_2d_array : require\n");
       PAD_GPU_SHADER5(glsl_hdr);
       STRCAT_WITH_RET(glsl_hdr, "precision highp float;\n");
       STRCAT_WITH_RET(glsl_hdr, "precision highp int;\n");