Add dependencies for CLD3 (#235)

This reflects commit d5cabfe5c65ac29d2f9c151b46c01a9fd885a9e0 in mastodon
repository.

Running-Mastodon/Production-guide.md

@@ -119,14 +119,14 @@ It is recommended to create a special user for mastodon on the server (you could
 
 ### Ubuntu / Debian
 
-    sudo apt-get install imagemagick ffmpeg libpq-dev libxml2-dev libxslt1-dev file git curl
+    sudo apt-get install imagemagick ffmpeg libpq-dev libxml2-dev libxslt1-dev file git curl g++ libprotobuf-dev protobuf-compiler
     curl -sL https://deb.nodesource.com/setup_6.x | sudo bash -
     sudo apt-get install nodejs
     sudo npm install -g yarn
 
 ### CentOS / RHEL
 
-    sudo yum install libxml2-devel ImageMagick libxslt-devel git curl file
+    sudo yum install libxml2-devel ImageMagick libxslt-devel git curl file g++ protobuf-compiler protobuf-devel
     sudo yum -y install epel-release
     sudo rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro
     sudo rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-5.el7.nux.noarch.rpm