NVIDIA IndeX libraries for ParaView 5.9

Things to adapt after the NVIDIA IndeX libraries have been shipped:

• Run extract-index.sh and update MD5 checksums to those of the generated files.
• Update the date in "nvidia-index-libs-5.9.00000000".
• Move DEFAULT from 2.4 to 5.9.

This commit also adds POWER9 (ppc64le) libraries and the new libnvindex_builtins.(so|dll).

Please merge only after the updated NVIDIA IndeX libraries have been received. After that, the updated header files must be added with paraview!4483 (merged).

Cc: @ben.boeckel @utkarsh.ayachit

Scripts/index/extract-index.sh

@@ -32,13 +32,13 @@ cd "$dirname"
 readonly dirprefix="nvidia-index-libs-$version.$date$count_suffix"
 
 for arch in linux-x86-64 linux-ppc64le nt-x86-64; do
-    case $arch in
+    case "$arch" in
         linux-x86-64)
             dir="$dirprefix-linux"
             ;;
         linux-ppc64le)
-            if [ ! -d "$arch" ]; then
-                # This architecure is optional, ignore if it's missing from the tarball
+            if ! [ -d "$arch" ]; then
+                # This architecture is optional, ignore if it's missing from the tarball.
                 continue
             fi
             dir="$dirprefix-linux-ppc64le"