Failed to detect trunk clang to support pre-compiled format

[yujincheng08]

This one does not compile: https://godbolt.org/z/x315Y9q8Y

However, once we manually define FMT_USE_NONTYPE_TEMPLATE_ARGS, it does compile: https://godbolt.org/z/nf1YPfMvG

[vitaut]

The compiler reports class types in non-type template parameters as not supported: https://godbolt.org/z/5G1ro8G35. But we could check the clang version explicitly and enable this anyway (a PR is welcome).

[yujincheng08]

You are right, https://en.cppreference.com/w/cpp/compiler_support also mentions this.

[yujincheng08]

PRed