MakeLib.cmake: add proper RPATH to libraries when BA_PY_PACKAGE = ON

cmake/BornAgain/MakeLib.cmake

@@ -36,7 +36,7 @@ function(MakeLib name lib tmpdir withPython)
     # see 'Dynamic-Link Library Search Order'
     # <https://docs.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-search-order>
 
-    if(APPLE AND BA_APPLE_BUNDLE)
+    if(APPLE AND (BA_APPLE_BUNDLE OR BA_PY_PACKAGE))
         # Add proper RPATHs as hints to load the dependencies at run-time
         set(link_flags "-Wl,-rpath,@loader_path -Wl,-rpath,@loader_path/extra")
         set_target_properties(${lib} PROPERTIES LINK_FLAGS ${link_flags})