This is a known and fixed issue in version 4.3 and higher.
The issue was resolved by adding a build define to the SGV module: _DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR
See reference:
godotengine/godot#95861
Possible solutions in libgodot:
(preferred) merge godot master branch to current branch
(ad hoc) add to godot\modules\svg\SCsub
if env.msvc: env_svg.Append(CPPDEFINES=["_DISABLE_CONSTEXPR_MUTEX_CONSTRUCTOR"])
and add
target_win_version=0x0A00
to the build_libgodot.bat as an arg to the scons calls