Switch to new download format and update source.sh script

pkg.info

@@ -1,16 +1,41 @@
 name: rustc
 description: The rust programming language compiler
 version: 1.90.0
+revision: 2
 url: https://www.rust-lang.org/
 license: Apache-2.0 or MIT
 architecture: any
-depends: ["curl","gcc","glibc","libssh2","lld","llvm-libs","openssl","zlib"]
-optional_depends: ["gdb"]
-make_depends: ["clang","cmake","libffi","llvm","perl","python3","rustc","gdb","procps-ng"]
 type: source
+depends:
+  - curl
+  - gcc
+  - glibc
+  - libssh2
+  - lld
+  - llvm-libs
+  - openssl
+  - zlib
+optional_depends:
+  - gdb
+make_depends:
+  - clang
+  - cmake
+  - libffi
+  - llvm
+  - perl
+  - python3
+  - rustc
+  - gdb
+  - procps-ng
+downloads:
+  - url: https://static.rust-lang.org/dist/rustc-${BPM_PKG_VERSION}-src.tar.xz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: 6bfeaddd90ffda2f063492b092bfed925c4b8c701579baf4b1316e021470daac
 split_packages:
   - name: rustc
     description: Rust documentation
   - name: rust-src
     description: Rust standard library source code
-    depends: ["rustc"]
+    depends:
+      - rustc