Mongo 3.6.17+ support on RHEL 8.0 support gaps

Hi Team,

In SERVER-54805, we explained the issue where we are seeing frequent issue with SECONDARY member getting unresponsive. 
 
Since we are not having clue why it worked in CentOS7 and not working well in centOS8, we have been trying hard to check what could be the differences.  we upgraded the glibc package and it delayed the issue in 2 runs. we used to see SEC issue in 6-12 hrs of run but with the latest glibc we see its holding good for 2 days but it didnt solve the problem. 
 
But as part of the RHEL 8.0 support, mongo has changed the evergreen.yaml and added scons_cache_scope: shared instead of use_scons_cache: true. But i dont see any reference of scons_cache_scope in the mongo 3.6 build code/script that parses. The scons_cache_scope relevent code are only in 4.x releases. 
 
So wondering if there are any gaps in the compilation of the mongo in RHEL itself.  please see the code-diff.
https://github.com/mongodb/mongo/commit/76dc06194037bee31b6eedb168f553be354b1a3c