meson.build: add a devenv
Set the same environment variables we pass to cargo as devenv so we can run:
$ meson devenv -C builddir $ cargo build
And have things happen as expected (this works because cargo runs up until it finds a Cargo.toml).
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Set the same environment variables we pass to cargo as devenv so we can run:
$ meson devenv -C builddir $ cargo build
And have things happen as expected (this works because cargo runs up until it finds a Cargo.toml).