Revert [libcxx] r323453 - [cmake] [libcxx] Call llvm_setup_rpath() when adding shared libraries.

Shoaib Meenai pointed out this will break standalone builds when built without llvm.

Differential Revision: https://reviews.llvm.org/D42459

llvm-svn: 323459
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 7e9453d5837f70284244dca2143fa5d8e491f955
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 70c8608..aa5ebf1 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -222,7 +222,6 @@
 # Build the shared library.
 if (LIBCXX_ENABLE_SHARED)
   add_library(cxx_shared SHARED $<TARGET_OBJECTS:cxx_objects>)
-  llvm_setup_rpath(cxx_shared)
   target_link_libraries(cxx_shared ${LIBCXX_LIBRARIES})
   set_target_properties(cxx_shared
     PROPERTIES