[Bug 233765] devel/protobuf: fix build with GCC-based architectures

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233765

            Bug ID: 233765
           Summary: devel/protobuf: fix build with GCC-based architectures
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: pkubaj at anongoth.pl
          Assignee: sunpoet at FreeBSD.org
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)

Created attachment 199808
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=199808&action=edit
patch

After update of protobuf to 3.6.1,1, it fails to build with GCC7 again.
Error:
google/protobuf/stubs/common.cc:52:2: error: #error "No suitable threading
library available."
 #error "No suitable threading library available."
  ^~~~~

The problem is that HAVE_PTHREAD is undefined. configure checks whether pthread
is available and then defines HAVE_THREAD, but only does so when _THREAD_SAFE
is defined, so we need to add _THREAD_SAFE to CFLAGS.

Tested on powerpc64 and amd64.

Hardware sponsored by IntegriCloud.

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