- The Apple SIP (System Integrity Protection) clears environment
variables, which affects the behaviour of dynamic library loading
(the DYLD_LIBRARY_PATH env variable).
OpenFOAM shadows this variable as FOAM_LD_LIBRARY_PATH, which has
been used to restore DYLD_LIBRARY_PATH (eg, in RunFunctions script).
However, this solution is not quite complete, as it
(a) requires sourcing of RunFunctions file,
(b) additional errors appear depending on a user workflow.
This changeset alleviates the problem by also iterating through
paths stored in the shadow variable when loading dynamic libraries
(if the DYLD_LIBRARY_PATH is empty).
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