cmake: resolve symlinks when comparing source directories.
Testcase: trying to use an existing build dir which was made for /d/foo where /d is a symlink to $HOME/d. To help understanding the problem, the error message now prints both source dirs, the one found in the builddir and the one we expected. Change-Id: I9a24fbd6ef3cf8108c5edba0d2a5b99ecdea0e89 Reviewed-by: Tobias Hunger <email@example.com>
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