contrib/rpm: Sync vendor config from bootc

contrib/packaging/bootupd.spec

@@ -55,19 +55,17 @@ License:        Apache-2.0 AND (Apache-2.0 WITH LLVM-exception) AND BSD-3-Clause
 
 %prep
 %autosetup -n %{crate}-%{version} -p1 -Sgit
-tar -xv -f %{SOURCE1}
-mkdir -p .cargo
-cat >.cargo/config << EOF
-[source.crates-io]
-replace-with = "vendored-sources"
-
-[source.vendored-sources]
-directory = "vendor"
-EOF
+# Default -v vendor config doesn't support non-crates.io deps (i.e. git)
+cp .cargo/vendor-config.toml .
+%cargo_prep -N
+cat vendor-config.toml >> .cargo/config.toml
+rm vendor-config.toml
 
 %build
 %cargo_build
 %cargo_vendor_manifest
+# https://pagure.io/fedora-rust/rust-packaging/issue/33
+sed -i -e '/https:\/\//d' cargo-vendor.txt
 %cargo_license_summary
 %{cargo_license} > LICENSE.dependencies