unwind: remove unnecessary header

Availablity.h is not used within config.h.  The locations which use the
availability infrastructure already include the necessary header(s).  NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@267365 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed
tree: ea942896614e58e5297da33d871a52b300effe91
  1. cmake/
  2. include/
  3. src/
  4. test/
  5. .arcconfig
  6. .clang-format
  7. CMakeLists.txt