Update CppInterOpConfig.cmake.in to get correct library location (#171)

When referencing config file while building xeus-clang-repl it sets the location of the library to the wrong location. This fix gives the right location.

Author: mcbarton

cmake/CppInterOp/CppInterOpConfig.cmake.in

@@ -16,7 +16,7 @@ if (IS_DIRECTORY "${CPPINTEROP_INSTALL_PREFIX}/include")
   set(_libs "${CPPINTEROP_INSTALL_PREFIX}/lib/${CMAKE_SHARED_LIBRARY_PREFIX}clangCppInterOp${CMAKE_SHARED_LIBRARY_SUFFIX}")
 else()
   set(_include "@CMAKE_CURRENT_SOURCE_DIR@/include")
-  set(_libs "@CMAKE_CURRENT_SOURCE_DIR@/lib/${CMAKE_SHARED_LIBRARY_PREFIX}clangCppInterOp${CMAKE_SHARED_LIBRARY_SUFFIX}")
+  set(_libs "@CMAKE_CURRENT_BINARY_DIR@/lib/${CMAKE_SHARED_LIBRARY_PREFIX}clangCppInterOp${CMAKE_SHARED_LIBRARY_SUFFIX}")
 endif()
 
 if (IS_DIRECTORY "${CPPINTEROP_INSTALL_PREFIX}/lib/cmake/CppInterOp")