Export version symbol to Python API again

[amotl]

Hi there,

first things first: Thanks a stack for conceiving and maintaining this excellent software.

While working on the GribMagic program, which uses the Magics Python bindings to libMagPlus, we discovered that the version symbol somehow stopped being exported starting with libMagPlus 4.7.0. We reported about our observations in detail at ecmwf/magics-python#39.

So, when accessing dll.version from Python, it croaked like

AttributeError: dlsym(0x7f7f59e05120, version): symbol not found

In turn, this also made selfcheck's report slightly bogus:

$ python -m Magics selfcheck
Found: Magics 'You are using an old version of magics ( < 4.0.0)'.
Your system is ready.

With this small patch, everything is in order again:

$ python -m Magics selfcheck
Found: Magics 'Magics 4.9.3'.
Your system is ready.

>>> import Magics.macro
>>> Magics.macro.version()
'Magics 4.9.3'

With kind regards,
Andreas.

[FussyDuck]

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