[Bug c/97618] undefined reference to LC11 building for target MinGW-w64 32-bit

[brechtsanders at users dot sourceforge.net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97618

--- Comment #4 from Brecht Sanders <brechtsanders at users dot sourceforge.net> ---
Found a smaller project to reproduce the issue with: building BLAKE3 v0.3.7
from
https://github.com/BLAKE3-team/BLAKE3 also has the issue when building with
GCC11 for 32-bit MinGW-w64.
Here I noticed that compiling with -O0 works around the problem, so the issue
must be in the compiler optimization for i686.