8186707: Remove libnio FileChannelImpl native close0() function
Summary: Remove Java_sun_nio_ch_FileChannelImpl_close0() on Unix and Windows and Java_sun_nio_ch_FileDispatcherImpl_closeByHandle on Windows only
Reviewed-by: alanb

8184807: (ch) Clean up handling of some Windows function return values in libnio
Summary: Properly check and respond to Windows function return values in libnio
Reviewed-by: alanb

8168417: Pending exceptions in java.base/windows/native/libnio
Reviewed-by: chegar, alanb

8055915: (ch) FileDispatcherImpl.truncate0 should use SetFileInformationByHandle [win]
Reviewed-by: alanb

8058099: (fc) Cleanup in FileChannel/FileDispatcher native implementation [win]
Reviewed-by: alanb

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