Update APIs to work with latest r2-5.x

[trufae]

Checklist

• [ ] Closing issues: #issue
• [ ] Mark this if you consider it ready to merge
• [ ] I've added tests (optional)
• [ ] I wrote some documentation

Description

[trufae]

The problem is how cmake builds the plugin, as all the symbols are global and messed up with the ones in r2. so retdec calls r2's capstone instead of the one it has been compiled with, this results on instruction ids that don't match and cause null derefs and undesirable crashes.

@xkubov do you know how to tame cmake to do that?