[Bug 212432] www/squid: Fix build with clang 3.9.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212432

            Bug ID: 212432
           Summary: www/squid: Fix build with clang 3.9.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: timp87 at gmail.com
             Flags: maintainer-feedback?(timp87 at gmail.com)
                CC: timp87 at gmail.com

Created attachment 174441
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174441&action=edit
Adapted upstream revision 14776 to fix clang 3.9.0 and higher build

While testing the clang390-import branch, I ran into the following -Werror
warnings when building www/squid:

In file included from TcpAcceptor.cc:15:
In file included from ../../src/comm/AcceptLimiter.h:12:
In file included from ../../src/comm/TcpAcceptor.h:13:
In file included from ../../src/base/AsyncJob.h:12:
In file included from ../../src/base/AsyncCall.h:12:
../../src/base/InstanceId.h:28:27: error: instantiation of variable
'InstanceId<MasterXaction>::Last' required here, but no definition is available
[-Werror,-Wundefined-var-template]
    InstanceId(): value(++Last ? Last : ++Last) {}
                          ^
../../src/MasterXaction.h:36:7: note: in instantiation of member function
'InstanceId<MasterXaction>::InstanceId' requested here
class MasterXaction : public RefCountable
      ^
../../src/base/InstanceId.h:47:18: note: forward declaration of template entity
is here
    static Value Last; ///< the last used ID value
                 ^
1 error generated.
*** [TcpAcceptor.lo] Error code 1

This has been fixed in upstream revision 14776 [1], by changing the
implementation of the InstanceId template class.  The upstream change does not
directly apply to squid 3.5.20, so I adapted it a little.

[1] http://bazaar.launchpad.net/~squid/squid/trunk/revision/14776

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