Delete support for segment selectors #500

Job	Run time
msrv	1m 55s
bench	1m 19s
Build fuzz targets	1m 10s
build (ubuntu-latest, stable)	40s
cross (i686-unknown-linux-gnu)	52s
build (ubuntu-latest, beta)	45s
features	2m 50s
cross (powerpc64-unknown-linux-gnu)	47s
build (ubuntu-latest, nightly)	44s
msrv-read	1m 47s
build (stable, macOS-latest)	40s
rustfmt	7s
coverage	1m 16s
doc	18s
Run `debug_abbrev` fuzz target	5m 5s
Run `debug_aranges` fuzz target	5m 5s
Run `debug_info` fuzz target	5m 5s
Run `debug_line` fuzz target	5m 10s
Run `eh_frame` fuzz target	5m 5s
Run `eh_frame_hdr` fuzz target	5m 5s
	45m 45s

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