RFR: JDK-8068597 - Add error code to to exception condition message resulting from GetAdaptersAddresses function calls

[Mark Sheppard]

Hi
     please oblige and review the following additional code to
src/java.base/windows/native/libnet/NetworkInterface_winXP.c

webrev: http://cr.openjdk.java.net/~msheppar/8068597/webrev/

JBS item: https://bugs.openjdk.java.net/browse/JDK-8068597

which is a temporary addition to assist in the investigation and diagnosis
of a problem on Windows in the NetworkInterface.getNetworInterfaces() 
call flow,
as highlighted in https://bugs.openjdk.java.net/browse/JDK-8065078

There are intermittent failures of the  GetAdaptersAddresses Windows API 
function call.
The extra diagnostic adds the error code to the Exception message thrown.

regards
Mark