[Bug c/106569] enhancement: use STL algorithm instead of a raw loop

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106569

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
std::find_if exists since c++98.

I'll go through these in a couple of weeks, it's probably not productive for
people who don't know the C++ std::lib well to bother analysing the
suggestions.