fix 'mmh3_hash' and 'mmh3_hash_from_buffer' result handling on 32bit …

[dshein-alt]

linux: i586, armh

• added conditional 'mmh3_hash' and 'mmh3_hash_from_buffer' functions result handling depending on target platform architecture

Current 32bit hash functions result conversion method fails on 32 bit architectures (confirmed on i586 and armh platforms).

__________________________________________ test_hash_unsigned __________________________________________

    def test_hash_unsigned():
>       assert mmh3.hash("foo", signed=False) == 4138058784
E       AssertionError: assert -156908512 == 4138058784
E        +  where -156908512 = <built-in function hash>('foo', signed=False)
E        +    where <built-in function hash> = mmh3.hash

test_mmh3.py:74: AssertionError
________________________________________ test_hash_from_buffer _________________________________________

    def test_hash_from_buffer():
        mview = memoryview("foo".encode("utf8"))
        assert mmh3.hash_from_buffer(mview) == -156908512
>       assert mmh3.hash_from_buffer(mview, signed=False) == 4138058784
E       assert -156908512 == 4138058784
E        +  where -156908512 = <built-in function hash_from_buffer>(<memory at 0xf71d82c8>, signed=False)
E        +    where <built-in function hash_from_buffer> = mmh3.hash_from_buffer

test_mmh3.py:181: AssertionError
======================================= short test summary info ========================================
FAILED test_mmh3.py::test_hash_unsigned - AssertionError: assert -156908512 == 4138058784
FAILED test_mmh3.py::test_hash_from_buffer - assert -156908512 == 4138058784

On 64 bit architectures (confirmed on x86_64, aarch64 and ppc64le platforms) applied conversion methods works fine and all tests passed.

Preprocessor conditions added to modify code when built on 32 bit platforms using predefined __LONG_WIDTH__ symbol available with GCC and Clang compilers.r conditions to modify code when built on 32 bit platforms using predefined __LONG_WIDTH__ symbol available with GCC and Clang compilers.

[hajimes]

Sorry for the delay, but now I merged your commit (with some modifications to prevent building failures on macos).

I am really thankful to you for providing detailed explanations so that the reader can easily follow problems and improvements.

[dshein-alt]

Glad to help, mate! ))