mesa: expose GL_EXT_texture_sRGB_decode on GLES 3.0+

Could be exposed on earlier GLES versions if we supported EXT_sRGB, but
we don't, for now.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

src/mesa/main/extensions_table.h

@@ -243,7 +243,7 @@ EXT(EXT_texture_object                      , dummy_true
 EXT(EXT_texture_rectangle                   , NV_texture_rectangle                   , GLL,  x ,  x ,  x , 2004)
 EXT(EXT_texture_rg                          , ARB_texture_rg                         ,  x ,  x ,  x , ES2, 2011)
 EXT(EXT_texture_sRGB                        , EXT_texture_sRGB                       , GLL, GLC,  x ,  x , 2004)
-EXT(EXT_texture_sRGB_decode                 , EXT_texture_sRGB_decode                , GLL, GLC,  x ,  x , 2006)
+EXT(EXT_texture_sRGB_decode                 , EXT_texture_sRGB_decode                , GLL, GLC,  x ,  30, 2006)
 EXT(EXT_texture_shared_exponent             , EXT_texture_shared_exponent            , GLL, GLC,  x ,  x , 2004)
 EXT(EXT_texture_snorm                       , EXT_texture_snorm                      , GLL, GLC,  x ,  x , 2009)
 EXT(EXT_texture_swizzle                     , EXT_texture_swizzle                    , GLL, GLC,  x ,  x , 2008)

src/mesa/main/texparam.c

@@ -568,8 +568,7 @@ set_tex_parameteri(struct gl_context *ctx,
       goto invalid_pname;
 
    case GL_TEXTURE_SRGB_DECODE_EXT:
-      if (_mesa_is_desktop_gl(ctx)
-          && ctx->Extensions.EXT_texture_sRGB_decode) {
+      if (ctx->Extensions.EXT_texture_sRGB_decode) {
          GLenum decode = params[0];
 
          if (!target_allows_setting_sampler_parameters(texObj->Target))