NMake Makefiles: Default to using the default Rust toolchain (for librsvg-2.56)
Hi,
This is the backport of !840 (merged) to the librsvg-2.56
branch, since I think it's better to honor the buildenv by all means and the USE_NIGHTLY_TOOLCHAIN
option needs to be folded into TOOLCHAIN_VERSION
altogether to be useful.
Witj blessings, thank you!