MDEV-7294 MTR does not use /dev/shm with a out-of-source build
mtr internally does the following: 1. $default_vardir=.... 2. $opt_vardir=$default_vardir unless $opt_vardir; 3. $opt_vardir=realpath $opt_vardir unless IS_WINDOWS 4. if ($opt_vardir eq $default_vardir) { .... use /dev/shm ... } thus we have to realpath $default_datadir too, otherwise the comparison logic might be broken
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