[PATCH] CMake: Set HOST_LINK_VERSION on Darwin (PR21268)

[Hans Wennborg]

Hi thakis,

The Autoconf build already does this, but it was never ported to CMake. The host linker version affects the flags that Clang pass to the linker, notably whether it passes -demangle or not.

http://reviews.llvm.org/D6239

Files:
  CMakeLists.txt
  include/clang/Config/config.h.cmake
  include/clang/Config/config.h.in
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