[MERGE][0.15] Bugfix #82086: Searching location of CA bundle for PyCurl in env variable (CURL_CA_BUNDLE), and on win32 along the PATH

[Bundle Buggy]

Bundle Buggy has detected this merge request.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3Cerucs1%249js%241%40sea.gmane.org%3E