[Debian-med-packaging] Bug#859202: warning: 'int readdir_r(DIR*, dirent*, dirent**)' is deprecated

[Mathieu Malaterre]

Control: fixed -1 3.6.4-2.1

According to upstream, this bug is solved:

% git show --oneline 35bc7e6fd60d8eca70e04fb0b32b8303806bc494 | head -1
35bc7e6fd Use readdir() instead of readdir_r() if safe.
% git tag --contains 35bc7e6fd60d8eca70e04fb0b32b8303806bc494
DCMTK-3.6.4
DCMTK-3.6.5
DCMTK-3.6.5+_20191213
DCMTK-3.6.6