Helper compiling script for Raspberry Pi

Contributor Hyenadae has developed a script that guides through the complete building process on RPis. The script's steps are as follows:

• Installs dependencies;
• Helps enabling VC4_DRM on RPis 0 to 3;
• Makes memory adjustments on RPis 0 and 1 to guarantee that compilation doesn't break;
• Allows installation modified SDL2 with KMS, which removes the need of X11 and guarantees the highest performance of any RPi running VC4;
• Clones sm64ex if the script is not inside a folder with the necessary files;
• Checks for assets and the existence of the baserom.*.z64;
• Compiles sm64ex.

The script is included on the master branch but can be downloaded here.