This is not useful because libjavascriptcoregtk has to export all
symbols needed by libwebkitgtk. All it does is detect intentional
changes in internal APIs.
It's unfortunate that the upstream design precludes any useful ABI
checks. I will continue arguing in favor of removing the split between
libjavascriptcoregtk and libwebkitgtk, which would avoid this problem.
Related: #2127467