Look for vcbuildtools.bat of VS 2015 as well (#9)

"Visual C++" has its build tool batch files in a different place.
Let's look there as well if we have not found 2017 or 2019 stuff.

Thanks to ReactOS project for figuring this out.

Co-authored-by: Victor Perevertkin <victor.perevertkin@reactos.org>

index.js

@@ -31,6 +31,11 @@ function findVcvarsall() {
             }
         }
     }
+    // Special case for Visual Studio 2015 (and maybe earlier), try it out too.
+    const path = `${programFiles}\\Microsoft Visual C++ Build Tools\\vcbuildtools.bat`
+    if (fs.existsSync(path)) {
+        return path
+    }
     throw new Error('Microsoft Visual Studio not found')
 }