read/coff: SymbolKind::Common detection was too broad #814

Job	Run time
msrv-read	3m 46s
cross (i686-unknown-linux-gnu)	1m 26s
cross (powerpc64-unknown-linux-gnu)	2m 23s
coverage	2m 36s
build (ubuntu-latest, stable)	1m 16s
doc	39s
build (ubuntu-latest, beta)	1m 16s
features	48s
build (ubuntu-latest, nightly)	1m 14s
msrv-all	3m 55s
build (stable, macOS-latest)	1m 45s
rustfmt	7s
	21m 11s

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