build/mongodl.py: Port mongo-c-driver to Fedora (#1111)

Port the build system to Fedora by extending DISTRO_VERSION_MAP by
a mapping from Fedora version 32-36 to RHEL version 8 according to
official Fedora documentation:
https://docs.fedoraproject.org/en-US/quick-docs/fedora-and-red-hat-enterprise-linux



Signed-off-by: Michał Grzelak <mig@semihalf.com>