K 10
svn:author
V 7
zeising
K 8
svn:date
V 27
2020-08-18T17:41:24.315825Z
K 7
svn:log
V 133
cad/iverilog: Fix build with -fno-common

Fix the build with -fno-common, which is the default in llvm 11 (and gcc10).

MFH:		2020Q3

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