message: Update BuildingForEveryPlatform.md
  Switch `.multirust` directories to `.rustup` ones.
diff: @@ -125,9 +125,9 @@ All you need to install is the SDL2 libraries but it's a pain in the butt. The
  > SDL2-devel-2.0.x-VC\SDL2-2.0.x\lib\x64\
  to the Rust library folder. For Rustup users (most common), this folder will be in
  - > C:\\Users\\{Your Username}\\.multirust\\toolchains\\{current toolchain}\\lib\\rustlib\\{current toolchain}\\lib
  + > C:\\Users\\{Your Username}\\.rustup\\toolchains\\{current toolchain}\\lib\\rustlib\\{current toolchain}\\lib
  - or to (for Rust 1.6 and above)
  + or, if not using Rustup, to (for Rust 1.6 and above)
  > C:\\Program Files\\Rust\\**lib**\\rustlib\\x86_64-pc-windows-msvc\\lib
  or to (for Rust versions 1.5 and below)
  