Mention Wine for non-Windows OSs in documentation

documentation/gettingstarted.md

@@ -22,6 +22,8 @@ You'll need a few things to get a decompilation workflow ready:
   your C++ code
   - You'll also want to add its `Bin/` directory to your `PATH` so that objdiff
     can find it
+  - If not on Windows, `CL.EXE` and friends can be passed to
+    [Wine](https://www.winehq.org) to run the compiler on other platforms
 - The [Git](https://git-scm.com/) version control tool to clone and work on
   this repository
 - [Java](https://jdk.java.net/archive/) 21 or later, as required by Ghidra.