meson: Don't vendor dependencies in dist

We already had attacks on tarballs on the original package levels with
XZ Utils. If we bundle a lot of tarballs in every of our tarballs, that
makes things even harder to trace.

build-aux/meson/dist-vendor.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-export DIST="$1"
-export SOURCE_ROOT="$2"
-
-cd "$SOURCE_ROOT"
-mkdir "$DIST"/.cargo
-cargo vendor | sed 's/^directory = ".*"/directory = "vendor"/g' > $DIST/.cargo/config
-# Move vendor into dist tarball directory
-mv vendor "$DIST"