this fixes a failure in 'auth_file_symlink_segfault_bug4145' #1526
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(test case 24 in t/modules/mod_auth_file.t). The test fails
because symlink is not resolved properly as shown in log:
2022-08-18 09:11:25,122 ST-ul-cbe proftpd[21479]: mod_auth_file/1.0: unable to stat AuthUserFile '/scratch/userland-gate/components/proftpd/build/amd64/tests/../../authfile.passwd': No such file or directory
this change fixes the failure.