bug#42448: A possible solution

[Brett Gilio]

As Marius Bakke pointed out on IRC, this issue is related to a change in
CMake where after 3.15 they removed the explicit `#define
_FILE_OFFSET_BITS 64`. The solution solution to this is to add

--8<---------------cut here---------------start------------->8---
CFLAGS="-D_FILE_OFFSET_BITS=64"
CXXFLAGS="-D_FILE_OFFSET_BITS=64"
--8<---------------cut here---------------end--------------->8---

to CMakes compilation procedure. This is a core-updates change. I will
leave this issue open for now in case this needs more
investigation. Since I am just coming off of a haitus I think there are
changes to the core-updates and staging procedures so I dont think I am
comfortable making this change myself.

Brett Gilio