Merge pull request #19481 from keithc-ca/build8

Restore advice for setting INCLUDE environment variable

Author: pshipton

doc/build-instructions/Build_Instructions_V8.md

@@ -394,6 +394,12 @@ export PATH="/cygdrive/c/Program Files/LLVM_32/bin:$PATH" (in Cygwin for 32bit)
 Add the path to `nasm.exe` to the `PATH` environment variable to override the older version of NASM installed in Cygwin. e.g.
 ```
 export PATH="/cygdrive/c/Program Files/NASM:$PATH" (in Cygwin)
+```
+
+Update your `INCLUDE` environment variable to provide a path to the Windows debugging tools with the following command:
+
+```
+set INCLUDE=C:\Program Files\Debugging Tools for Windows (x64)\sdk\inc;%INCLUDE%
 ```
 
    You can download Visual Studio manually or obtain it using the [wget](https://www.gnu.org/software/wget/faq.html#download) utility. If you choose to use `wget`, follow these steps: