Switch to new download format and add maintainers field

pkg.info

@@ -1,9 +1,20 @@
 name: nettle
 description: Low-level cryptographic library
 version: 3.10.2
+revision: 2
 url: https://www.lysator.liu.se/~nisse/nettle
 license: LGPL3-or-later or GPL2-or-later
+maintainers:
+  - [email protected]
 architecture: any
-depends: ["glibc","gmp"]
-make_depends: ["valgrind"]
 type: source
+depends:
+  - glibc
+  - gmp
+make_depends:
+  - valgrind
+downloads:
+  - url: https://ftpmirror.gnu.org/gnu/nettle/nettle-${BPM_PKG_VERSION}.tar.gz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: fe9ff51cb1f2abb5e65a6b8c10a92da0ab5ab6eaf26e7fc2b675c45f1fb519b5

source.sh

@@ -2,16 +2,6 @@
 # BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
 # BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT
 
-DOWNLOAD="https://ftpmirror.gnu.org/gnu/nettle/nettle-${BPM_PKG_VERSION}.tar.gz"
-FILENAME="${DOWNLOAD##*/}"
-
-# The prepare function is executed in the root of the temp directory
-# This function is used for downloading files and putting them into the correct location
-prepare() {
-  wget "$DOWNLOAD"
-  tar -xvf "$FILENAME" --strip-components=1 -C "$BPM_SOURCE"
-}
-
 # The build function is executed in the source directory
 # This function is used to compile the source code
 build() {