MFH: r467840

net/ceph: drop bogus flavor specifier

Unsuffixed binaries are only installed for default python version.

$ DEFAULT_VERSIONS=python=3.6 make
[...]

> ceph-12.2.4_1 depends on executable: sphinx-build - not found

> ceph-12.2.4_1 depends on executable: virtualenv - not found

PR: 227260
Approved by: ports-secteam blanket