Added missing library to the debian install list

Docs/BuildingUpgrade.md

@@ -4,21 +4,28 @@ Interested in contributing to Etterna? This guide is the place to start!
 
 ## Table of Contents
 
-- [Getting Started](#Getting-Started)
-- [Quick Start](#Quick-Start)
-- [Universal Dependencies](#Universal-Dependencies)
-  - [Linux Dependencies](#Linux-Dependencies)
-  - [Windows Dependencies](#Windows-Dependencies)
-  - [macOS Dependencies](#macOS-Dependencies)
-- [Project Generation](#Project-Generation)
-  - [CLI Project Generation](#CLI-Project-Generation)
-  - [GUI Project Generation](#GUI-Project-Generation)
-- [Compiling](#Compiling)
-  - [Ninja](#Ninja)
-  - [Linux](#Linux)
-  - [macOS](#macOS)
-  - [Windows](#Windows)
-- [Distribution](#Distribution)
+- [Building Etterna](#building-etterna)
+  - [Table of Contents](#table-of-contents)
+  - [Getting Started](#getting-started)
+  - [Quick Start](#quick-start)
+  - [Universal Dependencies](#universal-dependencies)
+    - [Linux Dependencies](#linux-dependencies)
+    - [Windows Dependencies](#windows-dependencies)
+    - [macOS Dependencies](#macos-dependencies)
+  - [Project Generation](#project-generation)
+    - [CLI Project Generation](#cli-project-generation)
+      - [Sample CMake Commands](#sample-cmake-commands)
+    - [GUI Project Generation](#gui-project-generation)
+  - [Compiling](#compiling)
+    - [Ninja](#ninja)
+    - [Linux](#linux)
+    - [macOS](#macos)
+      - [Xcode Editor](#xcode-editor)
+      - [Xcode CLI](#xcode-cli)
+    - [Windows](#windows)
+      - [Visual Studio Editor](#visual-studio-editor)
+      - [Visual Studio CLI](#visual-studio-cli)
+  - [Distribution](#distribution)
 
 ## Getting Started