Delete support for segment selectors #468

Job	Run time
Build fuzz targets	1m 9s
coverage	1m 5s
bench	1m 14s
build (ubuntu-latest, stable)	1m 0s
build (ubuntu-latest, beta)	53s
cross (i686-unknown-linux-gnu)	43s
features	2m 54s
build (ubuntu-latest, nightly)	45s
cross (powerpc64-unknown-linux-gnu)	57s
doc	24s
build (stable, macOS-latest)	44s
msrv	1m 21s
msrv-read	1m 15s
rustfmt	5s
Run `debug_abbrev` fuzz target	5m 10s
Run `debug_aranges` fuzz target	5m 6s
Run `debug_info` fuzz target	5m 10s
Run `debug_line` fuzz target	5m 8s
Run `eh_frame` fuzz target	5m 6s
Run `eh_frame_hdr` fuzz target	5m 14s
	45m 23s

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