K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-03-29T20:03:46.999863Z
K 7
svn:log
V 261
fsck_ffs/fsdb: fix -fno-common build

This one is also a small list:

- 3x duplicate definition (ufs2_zino, returntosingle, nflag)
- 5x 'needs extern', 3/5 of which are referenced in fsdb

-fno-common will become the default in GCC10/LLVM11.

MFC after:	1 week

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