devhelp jump from search results not working anymore

[bartlibert]

Starting from commit 28802c407dd90e06315aad68593d43b6ab35d1e7, the linkmap for devhelp is broken.

For example, when searching for "memset" I will still see the results for "memset" and "std::memset" in the devhelp program, but when I click on "memset", I will go to the "C reference" homepage, instead of the memset page, and similarly I will be sent to the "C++ reference" homepage for std::memset.

Before this changeset, this worked fine.

Logs for wrong and correct generation are here: https://gist.github.com/bartlibert/40198ca4cb638c8ca017