example:
1:export PUBLIC_VERSION_POSTFIX=rc1 for create a rc1 version
2:export PUBLIC_VERSION_POSTFIX=dev20210225 for create daily version
3:export PUBLIC_VERSION_POSTFIX=rc1.dev20210225 and export LOCAL_VERSION=mc40 for create special version
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as some reason: some version of trt/cudnn need
-Wl,--whole-archive attribute to fix cuda issue,
target A(CMAKE OBJECT,eg megbrain/megdnn): -Wl,--whole-archive depend on trt/cudnn
target B(SHARED LIBS,eg libmegengine.so) --> A with `PUBLIC` depends
target C(SHARED LIBS,eg _impertive.so) --> B with `PUBLIC` depends,
then ld will force link fatbin section into C, which will be undesired

what`s more, attribute PUBLIC/PRIVATE do not take effect
to OBJECT library(megbrain/megdnn)

what`s more, megengine/megengine_export have to PUBLIC for
mgb/imperative target, as SRC/include depends

so we pull cudalib depend from megbrain/megdnn to
megengine/megengine_export on linux os, to finall
target at windows os, for example lar on windows

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b2dbda96b, and add macos/windows whl import test, Integration Test will
test linux whl import, so we do not add linux import test at MR test

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env when value include more than two python version

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