Platform: correct linked import library name

When linking on a case sensitive file system, the import library must be
named with the matching case.  The import library is named
`ComDlg32.Lib` in the SDK, adjust the case.

Author: compnerd

stdlib/public/Platform/winsdk.modulemap

@@ -144,7 +144,7 @@ module WinSDK [system] {
       header "commdlg.h"
       export *
 
-      link "Comdlg32.lib"
+      link "ComDlg32.Lib"
     }
   }