Vadim Khotilovich 00eda28b3c MinGW: shared library prefix and appveyor CI (#2539)
* for MinGW, drop the 'lib' prefix from shared library name

* fix defines for 'g++ 4.8 or higher' to include g++ >= 5

* fix compile warnings

* [Appveyor] add MinGW with python; remove redundant jobs

* [Appveyor] also do python build for one of msvc jobs
2017-07-25 01:06:47 -05:00
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