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cmBinUtilsLinuxELFLinker: Cache ldconfig results

Atilhan Emre Dursunoglu requested to merge thelta/cmake:cache-ldconfigpaths into master

Running GetLDConfigPaths in every ScanDependencies is expensive.

After a point, in our CI, our packaging times started to surpass our build times. After instrumenting cpack, I saw most of the time was spent cmLDConfigLDConfigTool::GetLDConfigPaths. After this change one of our cpack script, mostly installs shared libraries via install(RUNTIME_DEPENDENCY_SET) is down from 6 minutes to 2 minutes.

Edited by Brad King

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