be more portible

tools/pylib/_boutcore_build/build-wheels.sh

@@ -30,7 +30,7 @@ do
 done
 
 for whl in wheelhouse/*.whl; do
-    LD_LIBRARY_PATH=$(realpath ../../../lib/) repair_wheel "$whl"
+    LD_LIBRARY_PATH=$(pwd)/../../../lib/ repair_wheel "$whl"
 done
 
 ls -l /io/wheelhouse