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cmSourceFile: avoid unnnecessary copies

Tim Blechmann requested to merge timblechmann/cmake:feature/cmSourceFile-avoid-unnecessary-copy into master

not a big difference: in one of my projects it reduces the time spent in here from 210ms to 155ms, but it's a low hanging fruit

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the copies in cmSourceFile::FindFullPath are one of the hotspots of my build system: we can easily avoid them by capturing by reference instead of by value

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