Add librubberband and its dependencies

Closes #19

scripts.d/45-libsamplerate.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+LIBSR_REPO="https://github.com/libsndfile/libsamplerate.git"
+LIBSR_COMMIT="36dfd68836a185182775a0ca760dd2bbbcd53e30"
+
+ffbuild_enabled() {
+    # Dependency of GPL-Only librubberband
+    [[ $VARIANT == gpl* ]] || return -1
+    return 0
+}
+
+ffbuild_dockerstage() {
+    to_df "ADD $SELF /stage.sh"
+    to_df "RUN run_stage"
+}
+
+ffbuild_dockerbuild() {
+    git-mini-clone "$LIBSR_REPO" "$LIBSR_COMMIT" libsr
+    cd libsr
+
+    mkdir build
+    cd build
+
+    cmake -DCMAKE_TOOLCHAIN_FILE="$FFBUILD_CMAKE_TOOLCHAIN" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$FFBUILD_PREFIX" -DBUILD_SHARED_LIBS=NO -DBUILD_TESTING=NO -DLIBSAMPLERATE_EXAMPLES=OFF -DLIBSAMPLERATE_INSTALL=YES ..
+    make -j$(nproc)
+    make install
+
+    cd ../..
+    rm -rf libsr
+}