[Bug 215135] devel/llvm39: Build on Tier2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215135

            Bug ID: 215135
           Summary: devel/llvm39: Build on Tier2
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: brooks at FreeBSD.org
          Reporter: matthew at reztek.cz
             Flags: maintainer-feedback?(brooks at FreeBSD.org)
          Assignee: brooks at FreeBSD.org

Created attachment 177776
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177776&action=edit
build fixes for devel/llvm39

I recently did a build of llvm39 on powerpc64 using lang/gcc5 as the compiler.
USES=compiler:c++11-lib is selecting GCC from ports already, just a few fixes
are needed. I expect these fixes should benefit other Tier2 platforms but do
not have hardware to verify.

* Remove the BROKEN_powerpc64 line that was redundant anyway
* For the case where compiler is !clang, i.e. GCC, instead of setting BROKEN,
define _GLIBCXX_USE_C99 in order to expose std::to_string, std::stod, etc.
* Add missing include of climit which clang seems to always pull in

In the process of getting llvm39 building on ppc64, I also noticed one patch
appears to have been carried over from llvm38 without being updated, so I
corrected that as well.

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