Make libnuma optional (#203)

libucx 1.15 made libnuma optional. Only include libnuma in the wheel if our libucx depends on it.

Authors:
  - Kyle Edwards (https://github.com/KyleFromNVIDIA)

Approvers:
  - Peter Andreas Entschev (https://github.com/pentschev)
  - Bradley Dice (https://github.com/bdice)
  - https://github.com/jakirkham
  - Jake Awe (https://github.com/AyodeAwe)

URL: #203

ci/build_wheel.sh

@@ -105,7 +105,9 @@ elif [[ ${package_name} == "ucxx" ]]; then
             patchelf --replace-needed libuct.so.0 $LIBUCT $f
             patchelf --replace-needed libucs.so.0 $LIBUCS $f
             patchelf --replace-needed libucm.so.0 $LIBUCM $f
-            patchelf --replace-needed libnuma.so.1 $LIBNUMA $f
+            if [[ -n "$LIBNUMA" ]]; then
+                patchelf --replace-needed libnuma.so.1 $LIBNUMA $f
+            fi
             patchelf --add-rpath '$ORIGIN/..' $f
         fi
     done