lit.cfg: Respect the DYLD_LIBRARY_PATH restrictions when not using %target-run #24101
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Some test cases use something like
That does not respect the %target-run DYLD_LIBRARY_PATH for choosing the just built libraries and/or OS libraries.
This PR respects said library path in such situations by exporting them to the sub-shell created
rdar://problem/49835064
Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
Resolves SR-NNNN.