Don't rely on the LD_LIBRARY_PATH for prebuilt modules.
Don't rely on the LD_LIBRARY_PATH for prebuilt modules.

The system integrity protection (SIP) on osx blocks 'dangerous' env variables
when spawning a new process. The MetaProcessor command `.!` which calls the
shell does not propagate (DY)LD_LIBRARY_PATH variables which prevents cling
from finding the modules.

This patch introduces a new env variable CLING_PREBUILT_MODULE_PATH which
contains the prebuilt modules' location where cling should look for modules.

Patch by Alexander Penev!

root-mirror/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling