[Bug c++/108169] class type template parameters are const in GCC (differs from other compilers)

[danakj at orodu dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108169

--- Comment #1 from danakj at orodu dot net ---
Sorry I inverted my logic.

In Clang and MSVC an `auto` class-type template parameter is not const. In GCC
it is.