SKCore: adjust library loading for Windows

The libIndexStore and sourcekitdInProc DLLs actually reside in the
binaries directory on Windows.  Adjust the paths appropriately for
Windows.  This is required to get the libraries to load correctly.

Author: compnerd

Sources/SKCore/Toolchain.swift

@@ -152,14 +152,22 @@ extension Toolchain {
       self.sourcekitd = sourcekitdPath
       foundAny = true
     } else {
+#if os(Windows)
+      let sourcekitdPath = binPath.appending(component: "sourcekitdInProc\(dylibExt)")
+#else
       let sourcekitdPath = libPath.appending(component: "libsourcekitdInProc\(dylibExt)")
+#endif
       if fs.isFile(sourcekitdPath) {
         self.sourcekitd = sourcekitdPath
         foundAny = true
       }
     }
 
+#if os(Windows)
+    let libIndexStore = binPath.appending(components: "libIndexStore\(dylibExt)")
+#else
     let libIndexStore = libPath.appending(components: "libIndexStore\(dylibExt)")
+#endif
     if fs.isFile(libIndexStore) {
       self.libIndexStore = libIndexStore
       foundAny = true