UBUNTU: [Packaging] quiet (nomially) benign errors in BUILD script

Though the assembly errors we see in the linux-restricted-modules builds
themselves are benign (the .ko checksums are validated) the same erroneous
commands are not (always) benign in the final end-user installations.
Eliminate these extra commands in the final end-user BUILD script.

BugLink: https://bugs.launchpad.net/bugs/1919315
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

debian/scripts/dkms-build--nvidia-N

@@ -80,6 +80,9 @@ grep /usr/bin/ld.bfd "$log" | sed -e "s@$build/@@g" \
 		cp "$base/signatures/$package/"*".ko.sig" "$pkgdir/bits"
 		sha256sum -c "$base/signatures/$package/SHA256SUMS" || exit 1
 		sh ./CLEAN
+
+		sed -i '/objdump/d' ./BUILD
+
 	else
 		# We are in the main kernel, put the .kos together as we will
 		# on the users machine, sign them, and keep just the signature.