maint: fix syntax-check sc_prohibit_int_ijk exclude rule

maint: fix syntax-check sc_prohibit_int_ijk exclude rule

Fix the regex for excluding files for this syntax-rule.  The rule "include/"
will not work, because we are matching the whole line like this
"^(...|include/|...)$ so we need to use "include/libvirt/libvirt.+".  The second
issue is that we are using only one '$' but there should be two of those at the
end.  The last small adjustment is to escape dots '.' so it match only dot.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
(cherry picked from commit a94efa50e253cb59a2925dca2705bce801f46fb1)