mesa/main: do not allow integer-texture enums before gles3

Integer textures shouldn't be implicitly exposed on OpenGL ES 1.x and
2.x, but because the code checked against a driver-capability rather
than using an extension-check helper, we ended up accidentally allowing
these enums on older versions when the driver supports it.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/mesa/main/glformats.c

@@ -2142,7 +2142,7 @@ _mesa_error_check_format_and_type(const struct gl_context *ctx,
             case GL_UNSIGNED_SHORT:
             case GL_INT:
             case GL_UNSIGNED_INT:
-               return ctx->Extensions.EXT_texture_integer
+               return _mesa_has_integer_textures(ctx)
                   ? GL_NO_ERROR : GL_INVALID_ENUM;
             default:
                return GL_INVALID_ENUM;
@@ -2508,7 +2508,7 @@ _mesa_base_tex_format(const struct gl_context *ctx, GLint internalFormat)
       }
    }
 
-   if (ctx->Extensions.EXT_texture_integer) {
+   if (_mesa_has_integer_textures(ctx)) {
       switch (internalFormat) {
       case GL_ALPHA8UI_EXT:
       case GL_ALPHA16UI_EXT: