Add fallback for old cpptrace versions that don't provide <cpptrace/b… #552

Job	Run time
test-linux-add_subdirectory	1m 2s
test-linux-fetchcontent	42s
test-linux-findpackage	27s
test-macos-add_subdirectory	37s
test-macos-fetchcontent	36s
test-macos-findpackage	28s
test-mingw-add_subdirectory	3m 7s
test-mingw-fetchcontent	3m 12s
test-mingw-findpackage	1m 52s
test-windows-add_subdirectory	1m 47s
test-windows-fetchcontent	1m 9s
test-windows-findpackage	1m 10s
	16m 9s

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