cvs -- sanity.sh invalid option nit

[David Taylor]

In the file sanity.sh in cvs's src directory (on the trunk), test
basicb-21, there's the line:

    "admin: invalid option -- H

but what is actually printed by getopt in glibc (and hence by cvs) is:

    "admin: invalid option -- 'H'

(note the single quotes around the H).  This causes the test to fail.

Glibc has had the single quotes since, at least, release 2.9; the
current release is 2.13.