C++: all: add script for dependencies

Installation of dependencies, if it is necessary, was added. Now all
required dependencies (such as pigpio) can be installed independently.

Author: corteccia

C++/Navio/get_dependencies.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+ARCH=`dpkg --print-architecture`
+
+confirm_guard() {
+    echo "Would you like to install missing dependencies (requires sudo)? [y/n]"
+    while true; do
+        read answer
+        case $answer in
+            [Yy]* ) return ;;
+            [Nn]* ) exit ;;
+            * ) echo "Wrong answer" ;;
+        esac
+    done
+}
+
+if [[ "$ARCH" == *"arm"* ]]; then
+    if ! dpkg -s pigpio &> /dev/null; then
+        confirm_guard
+        sudo apt-get update
+        sudo apt-get install pigpio
+    fi
+else
+    git submodule update --init --recursive;
+    pushd pigpio;
+    make CROSS_PREFIX=arm-linux-gnueabihf-
+    popd;
+fi