Update package version to 0.15.4

pkg.info

@@ -1,9 +1,17 @@
 name: liburcu
 description: LGPLv2.1 userspace RCU (read-copy-update) library
-version: 0.15.3
+version: 0.15.4
+revision: 1
 url: https://liburcu.org/
 license: LGPL2.1-or-later,CC-BY-4.0
 architecture: any
-depends: ["glibc"]
-make_depends: ["bzip2"]
 type: source
+depends:
+  - glibc
+make_depends:
+  - bzip2
+downloads:
+  - url: https://lttng.org/files/urcu/userspace-rcu-${BPM_PKG_VERSION}.tar.bz2
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: 11a14a7660ac9ba9c0bbd3b2d81718523d27dc6c8a9dfabd5e401b406673ee3a

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://lttng.org/files/urcu/userspace-rcu-${BPM_PKG_VERSION}.tar.bz2"
-FILENAME="${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() {