Remove now-obsolete DWARF parsing support #280

Job	Run time
Check generated C header	41s
Benchmark	3m 26s
Generate documentation	21s
Build [ubuntu-latest, 1.63.0, dev, ]	1m 4s
Build [ubuntu-latest, 1.63.0, release, ]	1m 18s
Build [ubuntu-latest, stable, dev, ]	27s
Build [ubuntu-latest, stable, release, ]	29s
Build [macos-latest, 1.63.0, dev, ]	2m 33s
Build [macos-latest, 1.63.0, release, ]	2m 7s
Build [macos-latest, stable, dev, ]	1m 2s
Build [macos-latest, stable, release, ]	1m 8s
Build [ubuntu-latest, stable, dev, --no-default-features]	24s
Lint with clippy	50s
No-op rebuilds	51s
Check code formatting	14s
Test and coverage	2m 4s
Test with release build	2m 46s
Test with address sanitizer	4m 3s
Test with leak sanitizer	3m 40s
	29m 28s

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