[issue35755] Remove current directory from posixpath.defpath to enhance security

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

find_executable() first looks if the program exists in the current directory. My PR doesn't change that. I have no opinion if it's a good thing or not, but I don't want to change that in this PR. If someone wants to change it, please open a separated issue on bugs.python.org since it will be backward incompatible change not directly related to this issue.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35755>
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