[Bug 248737] devel/libunwind: Fix build with -fno-common (clang 11 and gcc 10)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248737

            Bug ID: 248737
           Summary: devel/libunwind: Fix build with -fno-common (clang 11
                    and gcc 10)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)
          Assignee: sunpoet at FreeBSD.org

Created attachment 217322
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217322&action=edit
Fix build with -fno-common (clang 11 and gcc 10)

In base r364284, I imported clang 11 into head. Like gcc 10, it now defaults to
-fno-common, meaning that duplicated global symbols will most likely lead to
link errors. Here is a patch to fix this port's duplicated global symbols.

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