Add a armv6hf crossbuild target

Tweak `armv6hf` crossbuild script

Fix example typo in Dockerfile

Changed File permissions

contrib/docker-build-pi-armv6hf.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+# Snipped and tucked from https://github.com/plietar/librespot/pull/202/commits/21549641d39399cbaec0bc92b36c9951d1b87b90
+# and further inputs from https://github.com/kingosticks/librespot/commit/c55dd20bd6c7e44dd75ff33185cf50b2d3bd79c3
+
+set -eux
+# Get alsa lib and headers
+ALSA_VER="1.0.25-4"
+DEPS=( \
+  "http://mirrordirector.raspbian.org/raspbian/pool/main/a/alsa-lib/libasound2_${ALSA_VER}_armhf.deb" \
+  "http://mirrordirector.raspbian.org/raspbian/pool/main/a/alsa-lib/libasound2-dev_${ALSA_VER}_armhf.deb" \
+)
+
+# Collect Paths
+SYSROOT="/pi-tools/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/arm-bcm2708hardfp-linux-gnueabi/sysroot"
+GCC="/pi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin"
+GCC_SYSROOT="$GCC/gcc-sysroot"
+
+
+export PATH=/pi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/:$PATH
+
+# Link the compiler
+export TARGET_CC="$GCC/arm-linux-gnueabihf-gcc"
+
+# Create wrapper around gcc to point to rpi sysroot
+echo -e '#!/bin/bash' "\n$TARGET_CC --sysroot $SYSROOT \"\$@\"" > $GCC_SYSROOT
+chmod +x $GCC_SYSROOT
+
+# Add extra target dependencies to our rpi sysroot
+for path in "${DEPS[@]}"; do
+  curl -OL $path
+  dpkg -x $(basename $path) $SYSROOT
+done
+
+# i don't why this is neccessary
+# ln -s ld-linux.so.3 $SYSROOT/lib/ld-linux-armhf.so.3
+
+# point cargo to use gcc wrapper as linker
+echo -e '[target.arm-unknown-linux-gnueabihf]\nlinker = "gcc-sysroot"' > /.cargo/config
+
+# Build
+cargo build --release --target arm-unknown-linux-gnueabihf --no-default-features --features "alsa-backend"