win32/rsvg-rust.mak: Streamline Rust build process
As the recommended way to setup Rust is via rustup, set the default toolchain/target during the NMake build process, so that one will only need to have the Rust executables in their PATH and ensure that they have the needed toolchains (i686-pc-windows-msvc and/or x86_64-pc-windows-msvc) installed via rustup. Please note that we are being conservative here-we use the stable releases of the toolchains only. If using a beta/nightly toolchain release, one needs to update this file for this purpose.
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