Resolve symlinks when checking for out-of-tree builds - #2800
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Otherwise, we might think it's an out-of-tree build when it's really an in-tree build. Then later, we get multiple definition errors w/ fmpz.c because we try to link it twice since it's in both the source and build directories (which look different but are really the same). Closes: flintlib#2799
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Otherwise, we might think it's an out-of-tree build when it's really an in-tree build. Then later, we get multiple definition errors w/ fmpz.c because we try to link it twice since it's in both the source and build directories (which look different but are really the same).
Closes: #2799