Read Nvidia Driver version via NVML

src/main/java/com/sheepit/client/os/Windows.java

@@ -42,6 +42,9 @@ public class Windows extends OS {
 	@Override public String getCUDALib() {
 		return "nvcuda";
 	}
+	@Override public String getNVMLLib() {
+		return "nvml";
+	}
 	
 	@Override public Process exec(List<String> command, Map<String, String> env) throws IOException {
 		// disable a popup because the renderer might crash (seg fault)