[c-index-test] CMake: When installing c-index-test to a different prefix directory, add an rpath so that
it can find libclang.

llvm-svn: 261445
diff --git a/clang/tools/c-index-test/CMakeLists.txt b/clang/tools/c-index-test/CMakeLists.txt
index 3958e95..e0df503 100644
--- a/clang/tools/c-index-test/CMakeLists.txt
+++ b/clang/tools/c-index-test/CMakeLists.txt
@@ -42,6 +42,8 @@
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   if(INTERNAL_INSTALL_PREFIX)
     set(INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/bin")
+    set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+       "@executable_path/../../lib")
   else()
     set(INSTALL_DESTINATION bin)
   endif()