nfs-utils: replace problematic pending patch with upstream submission

nfs-utils: replace problematic pending patch with upstream submission

The now-removed patch was added for clang compatibility, but over time
started fixing problems that do not exist, and got its description
to mismatch the content.

The new patch is fixing the only problem with clang that still
occurs. I verified that all files that were patched before still
build without errors.

If you find other issues (this would be with non-default
options probably), please fix them similarly.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>