Type check SSA variables in __eq__

Instantly bail if we try to compare a SSAVariable to something that isn't an SSA Variable. Prevents the following issue:
```
>>> bv.get_functions_at(here)[0].medium_level_il.ssa_form[96].src[0].src
<ssa <var uint64_t rax_2> version 13>
>>> type(bv.get_functions_at(here)[0].medium_level_il.ssa_form[96].src[0].src)
<class 'binaryninja.mediumlevelil.SSAVariable'>
>>> bv.get_functions_at(here)[0].medium_level_il.ssa_form[96].src[0].src == 'rax_2'
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Applications/Binary Ninja.app/Contents/MacOS/plugins/../../Resources/python/binaryninja/mediumlevelil.py", line 48, in __eq__
    (other.var, other.version)
AttributeError: 'str' object has no attribute 'var'
```

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