create_test_serialisation: Dedup deps before joining ld_lib paths

In large monolithic codebases with many intertwined shared libraries, test
serialization can cause configuration times to balloon massively from a single
test() invocation due to concatenating the same paths many times over.

This commit adds an initial set in which all dependencies on a test target are
stored before their paths are constructed to form the test target's
LD_LIB_PATH. In testing on a particularly large codebase, this commit reduced
total configuration time by a factor of almost 8x.

0 files changed, 0 insertions, 0 deletions