Add tracing support for x86

[DMaroo]

This PR adds tracing support for x86. This will be useful while testing rizinorg/rizin#2747 with rz-tracetest.

In it's current state, the generated trace can be successfully read by libtrace, and seems to be okay from manual inspection. except it has wrong values for the rawbytes field. This results in invalid decompilation on Rizin's side, and therefore inability to use rz-tracetest. I believe the that the incorrect rawbytes value might be because of incorrect usage of gen_trace_endframe.

Unrelated changes:

• This PR initializes an uninitialized variable subqdict to avoid compiler warnings
• And changes the build file to use the correct paths for bap-frames
  • The compilation using the old build file failed with meson version 0.63.3)
  • Although the current build file works, but I think there may be a neater way to do it than use directory traversal in the build file

[DMaroo]

The x86 tracing is now working. The generated traces seem to be correct and I am able to run https://github.com/rizinorg/rz-tracetest on them. But I would advise not to merge this until I am done testing the IL, because there may be bugs. Once the trace testing is complete, we can be confident to merge it.

[XVilka]

@DMaroo have been there any updates since? How close is the testing?

[DMaroo]

I didn't get much time to work on this in the past few months. I am yet to verify the tracing for segment registers. I think I will be fairly confident about the tracing within 3 weeks. The PR can be merged then. Any other changes can then be incrementally merged, if needed.

[XVilka]

@DMaroo have you had any chance to look at this?

[DMaroo]

I think this the tracing instrumentation is majorly done for x86 and we can merge this now. We can address missing cases later on a case-by-case basis.