[issue20106] warn_dir is always true for install_data, even if an install_dir is specified

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


----------
nosy: +dstufft, eric.araujo
stage:  -> needs patch

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20106>
_______________________________________