8167481: cleanup of headers and includes for native libnet
Reviewed-by: chegar

8168471: Non ANSI C declaration of block local variable in NetworkInterface_winXP.c
Reviewed-by: chegar

8168405: Pending exceptions in java.base/windows/native
Reviewed-by: chegar, clanger

8167295: Further cleanup to the native parts of libnet/libnio
Reviewed-by: chegar

8065078: NetworkInterface.getNetworkInterfaces() triggers intermittent test failures
Reviewed-by: chegar

8068597: Add error code to to exception condition message resulting from GetAdaptersAddresses function calls
Summary: added error code to exception message thrown after a GetAdaptersAddresses call.
Reviewed-by: chegar

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com