K 10
svn:author
V 7
zeising
K 8
svn:date
V 27
2020-08-19T08:42:48.345789Z
K 7
svn:log
V 307
MFH: r545235

devel/libunwind: Fix build with -fno-common

Fix the build of devel/libunwind with -fno-common (the default on FreeBSD
current after the llvm 11 update).
Add an upstream patch (pulling it from the official github mirror) to fix
the build woth -fno-common.

Approved by:	ports-secteam (joenum)

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