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New arch support: PowerPC 64-bit, all ABIs, tested on v5.0+ kernels.
**Improvements:**
- Add ABI `bits` (integer) and `compat` (boolean) fields to JSON output.
- Support ELF symbols with weird names (special chars in the name).
- Support function descriptors for syscall table entries (useful for PowerPC64
and Itanium 64).
- Support weird arch-specific `SYSCALL_DEFINEn` macros.
- Building kernels now generates relative paths in DWARF debug symbols through
`-fdebug-prefix-map`.
- Improve stdout output and add a table header.
- Use `null` instead of `??`/`?` for unknown file/line info in JSON output.
- x86: improve dummy syscall implementation detection (handling endbr64/32
instructions).
- ARM OABI: output syscall number location for the calling convention
(`swi <NR>`).
**Bug fixes**:
- Correctly report `socketcall` depending on `CONFIG_NET=y`.
- Correctly strip more syscall symbol prefixes for more accurate syscall names.
- Fix bad symbol prefix detection in some weird edge cases, leading to wrong
syscall names.
- x86: fix wrong register names for x86-64 compat 32-bit ABI (IA-32).
**Internal changes**:
- Reorganize arch-specific code.
- Handle SIGINT for more graceful termination.
- Auto-remap definition locations relative to KDIR for ease of use.