Implements load libcapstone.so with RTLD_DEEPBIND #2912

[AGhebrea]

Your checklist for this pull request

• I've documented or updated the documentation of every API function and struct this PR changes.
• I've added tests that prove my fix is effective or that my feature works (if possible)

Detailed description

A possible implementation feature request #2912

Test plan

I locally installed the modified python bindings locally along with cstest_py and ran

cstest_py ./tests/details

All the tests passed. I think that this is sufficient, given that I don't modify the functionality of the capstone code.

[Rot127]

Now we have two version :D

#2913

[AGhebrea]

Tests were failing because musl does not implement RTLD_DEEPBIND.
mode = getattr(os, 'RTLD_DEEPBIND', 0) in 2fd8ea3 fixes that.