nsis: generate the cache without showing the console

extras/package/win32/NSIS/vlc.win32.nsi.in

@@ -220,7 +220,7 @@ ${MementoSection} $Name_Section01 SEC01
 @BUILD_LUA_TRUE@     !insertmacro InstallFolder lua
 
   ; Generate the cache and add it to uninstall.log
-  ExecWait "$INSTDIR\vlc-cache-gen.exe $INSTDIR\plugins"
+  nsExec::ExecToStack "$INSTDIR\vlc-cache-gen.exe $INSTDIR\plugins"
   FindFirst $0 $1 "$INSTDIR\plugins\*.dat"
   FileWrite $UninstallLog "plugins\$1$\r$\n"
   FindClose $0