Fix a copy and paste error

I copied this Cmake boilerplate snippet but forgot to delete it.
Signed-off-by: Thien Nguyen <nguyentm@ornl.gov>

lib/mirror_rb/CMakeLists.txt

@@ -40,17 +40,4 @@ install(TARGETS ${LIBRARY_NAME} DESTINATION ${CMAKE_INSTALL_PREFIX}/plugins)
 
 if (QCOR_BUILD_TESTS)
   add_subdirectory(tests)
-endif()
- 
-if(APPLE)
-  set_target_properties(${LIBRARY_NAME}
-                        PROPERTIES INSTALL_RPATH "@loader_path/../lib;${LLVM_INSTALL_PREFIX}/lib")
-  set_target_properties(${LIBRARY_NAME}
-                        PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
-else()
-  set_target_properties(${LIBRARY_NAME}
-                        PROPERTIES INSTALL_RPATH "$ORIGIN/../lib:${LLVM_INSTALL_PREFIX}/lib")
-  set_target_properties(${LIBRARY_NAME} PROPERTIES LINK_FLAGS "-shared")
-endif()
-
-install(TARGETS ${LIBRARY_NAME} DESTINATION ${CMAKE_INSTALL_PREFIX}/plugins)
\ No newline at end of file
+endif()
\ No newline at end of file