Add git submodule update to BUILDING.md (#2027)

* Added git submodule to building instructions

* Fixed git submodule build instruction order

* Removed --recursive flag from git submodule building instructions

* Removed windows git submodule instruction

BUILDING.md

@@ -85,6 +85,8 @@ _Note: If you're using Visual Studio Code, the [cpack plugin](https://marketplac
 # Clone the repo
 git clone https://github.com/HarbourMasters/Shipwright.git
 cd Shipwright
+# Clone the submodule libultraship
+git submodule update --init
 # Copy the baserom to the OTRExporter folder
 cp <path to your ROM> OTRExporter
 # Generate Ninja project
@@ -123,6 +125,8 @@ _Note: If you're using Visual Studio Code, the [cpack plugin](https://marketplac
 # Clone the repo
 git clone https://github.com/HarbourMasters/Shipwright.git
 cd ShipWright
+# Clone the submodule libultraship
+git submodule update --init
 # Copy the baserom to the OTRExporter folder
 cp <path to your ROM> OTRExporter
 # Generate Ninja project