[CMake] FindJsoncpp.cmake: Use foreach variable.

Use ${libname} instead of ${lib}. By a coincidence, this worked
because ${lib} also the variable used for finding the libjsoncpp.so
full path.

llvm-svn: 308288

polly/cmake/FindJsoncpp.cmake

@@ -49,7 +49,7 @@ if (Jsoncpp_FOUND)
     set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${incl})
   endforeach ()
   foreach (libname IN LISTS JSONCPP_LIBRARIES)
-    set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${lib})
+    set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_LINK_LIBRARIES ${libname})
   endforeach ()
   foreach (opt IN LISTS JSONCPP_DEFINITIONS)
     set_property(TARGET jsoncpp APPEND PROPERTY INTERFACE_COMPILE_OPTIONS ${opt})