meta: Don't use GLSL 1.30 shader on OpenGL ES 2

Fixes GLES2 CoverageGL conformance test.

NOTE: This is a candidate for the 9.0 branch.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>

src/mesa/drivers/common/meta.c

@@ -3100,7 +3100,7 @@ setup_glsl_generate_mipmap(struct gl_context *ctx,
 
    mem_ctx = ralloc_context(NULL);
 
-   if (ctx->Const.GLSLVersion < 130) {
+   if (ctx->API == API_OPENGLES2 || ctx->Const.GLSLVersion < 130) {
       const char *fs_template;
       const char *extension_mode;