Fs copy fix for "Invalid cross-device link"

[taclane]

Sometime between linux 5.3 and 5.18, a regression prevented files from copying across devices using copy_file_range(). Boost created a workaround for 1.78, and it was fixed in the 6.x kernel, but depending on what packages are offered in the distro, this problem may still remain.

Replicated with the following system:

libboost-all-dev/mantic,now 1.74.0.3ubuntu7 amd64 [installed]
libboost-filesystem-dev/mantic,now 1.74.0.3ubuntu7 amd64 [installed,automatic]

Linux system2 6.5.0-13-generic #13-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov  3 12:16:05 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

A boost::filesystem::copy_file: Invalid cross-device link: will occur when transmissionArchive is true, and trunk-recorder attempts to copy the tx wavs from a ram-based tempDir to conventional storage at captureDir at the conclusion of a call. Previous mitigation techniques were either to disable transmissionArchive, or move the tempDir to the same device as captureDir.

This should help address issues like #843 by allowing the users with affected kernels to manually install newer version of boost libs, or allow users with 6.x kernels and affected boost libs to use std::filesystem instead.

[robotastic]

You are a saint for hunting down the root cause of this bug and putting together a patch!