[cmake] [libunwind] Call llvm_setup_rpath() when adding shared libraries.

Clang and llvm already use llvm_setup_rpath(), so this change will
help standarize rpath usage across all projects.

Differential Revision: https://reviews.llvm.org/D42461

llvm-svn: 323496

Author: donhinton

libunwind/src/CMakeLists.txt

@@ -108,6 +108,9 @@ set(LIBUNWIND_TARGETS)
 # Build the shared library.
 if (LIBUNWIND_ENABLE_SHARED)
   add_library(unwind_shared SHARED $<TARGET_OBJECTS:unwind_objects>)
+  if(LLVM_FOUND)
+    llvm_setup_rpath(unwind_shared)
+  endif()
   target_link_libraries(unwind_shared ${libraries})
   set_target_properties(unwind_shared
                         PROPERTIES