Remove now-obsolete DWARF parsing support #277

Job	Run time
Build [ubuntu-latest, 1.63.0, dev, ]	58s
Build [ubuntu-latest, 1.63.0, release, ]	1m 18s
Build [ubuntu-latest, stable, dev, ]	24s
Build [ubuntu-latest, stable, release, ]	30s
Build [macos-latest, 1.63.0, dev, ]	1m 49s
Build [macos-latest, 1.63.0, release, ]	2m 5s
Build [macos-latest, stable, dev, ]	52s
Build [macos-latest, stable, release, ]	49s
Build [ubuntu-latest, stable, dev, --no-default-features]	22s
Lint with clippy	50s
Check generated C header	40s
Benchmark	4m 3s
No-op rebuilds	1m 3s
Test and coverage	1m 36s
Test with address sanitizer	4m 10s
Test with leak sanitizer	2m 45s
Check code formatting	17s
Generate documentation	23s
Test with release build	3m 2s
	27m 56s

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