Switch the default from building Meson recipes with MSVC by default to using MinGW. We still haven't fully solved the CRT interop issues w.r.t. backtraces and some APIs such as FILE. This fixes some blockers for the 1.15.1 release. This will be revisited for 1.15.2
I have tested a full from-scratch build with this change, and everything builds and works correctly for me.