Manually downloading the env package

This is the list of programs and libraries contained inside the env package

• gbdk 2020
• msys
• Make for Windows*
• BGB
• mod2gbt
• pngb
• romview
• Game Boy Map Builder
• Game Boy Tile Designer

*The make that comes with msys doesn't print any linker error messages and that's why you need to download make for windows too.