[Bug libstdc++/108062] Test spdlog c++20 std::format

[lukaszcz18 at wp dot pl via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108062

--- Comment #8 from Jamaika <lukaszcz18 at wp dot pl> ---
Thanks for tips std::formatter<PNM_COLOUR_SPACE>
Something has improved. GCC notices that there isn't <cmath> for TIFFFormat.cpp