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

Fixes gstreamer/cerbero#77
Fixes gstreamer/cerbero#83
Fixes gstreamer/cerbero#88