Fix 32bit pointer support

[Schamper]

Fixes #45.

[codecov]

Codecov Report

Merging #46 (3fe8d64) into main (f9a9f86) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   88.23%   88.23%           
=======================================
  Files          20       20           
  Lines        1709     1709           
=======================================
  Hits         1508     1508           
  Misses        201      201           

Flag	Coverage Δ
unittests	88.23% <100.00%> (ø)

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Files Changed	Coverage Δ
dissect/cstruct/cstruct.py	89.74% <100.00%> (ø)

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[Poeloe]

Maybe for the sake of preventing regression, add a test like:

    with patch("sys.maxsize", 2**64):
        c = cstruct.cstruct()
        assert c.pointer is c.uint64

    with patch("sys.maxsize", 2**32):
        c = cstruct.cstruct()
        assert c.pointer is c.uint32

    c = cstruct.cstruct(pointer="uint16")
    assert c.pointer is c.uint16

[Poeloe]

LGTM!