scripts/coverity: Drop --enable-libnfs from configure

The environment we do our coverity build in (amd64-fedora-container)
has just upgraded to Fedora 43.  This ships with libnfs version
16.2.0.  We can't currently build against that: in commit
e2d98f2571 we added a requirement to meson.build that libnfs be <
6.0.0, because of an upstream API change that we haven't yet updated
block/nfs.c to handle.

The result is that the coverity CI job currently fails in
configure:

Dependency libnfs found: NO. Found 16.2.0 but need: '<6.0.0' ;
matched: '>=1.9.3'
Run-time dependency libnfs found: NO
../meson.build:1150:11: ERROR: Dependency lookup for libnfs with
method 'pkgconfig' failed: Invalid version, need 'libnfs' ['<6.0.0']
found '16.2.0'.

Fix the coverity builds by dropping --enable-libnfs. This means we
will no longer have coverage of block/nfs.c until/unless we do
that update to handle the new libnfs API.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20260226111001.1021810-1-peter.maydell@linaro.org

scripts/coverity-scan/run-coverity-scan

@@ -424,7 +424,7 @@ echo "Configuring..."
     --enable-linux-aio --enable-attr \
     --enable-cap-ng --enable-trace-backends=log --enable-spice --enable-rbd \
     --enable-libusb --enable-usb-redir \
-    --enable-libiscsi --enable-libnfs --enable-seccomp \
+    --enable-libiscsi --enable-seccomp \
     --enable-tpm --enable-libssh --enable-lzo --enable-snappy --enable-bzip2 \
     --enable-numa --enable-rdma --enable-smartcard --enable-virglrenderer \
     --enable-mpath --enable-glusterfs \