K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2020-03-28T04:02:00.203920Z
K 7
svn:log
V 337
config(8): fixes for -fno-common

Move this handful of definitions into main.c, properly declare these as
extern in config.h. This fixes the config(8) build with -fno-common.

Unexplained in my previous commit to gas, -fno-common will become the
default in GCC10 and LLVM11, so it's worth addressing these in advance.

MFC after:	3 days

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