Bug 16844: (follow-up of 15656) Remove export of GetMemberRelatives from C4::Members

Bug 15656 removed the C4::Members::GetMemberRelatives subroutine but the
module still exports it.

Test plan:
  git grep GetMemberRelatives
should not return any results.

Signed-off-by: Marc Véron <veron@veron.ch>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

C4/Members.pm

@@ -60,7 +60,6 @@ BEGIN {
     push @EXPORT, qw(
         &Search
         &GetMemberDetails
-        &GetMemberRelatives
         &GetMember
 
         &GetMemberIssuesAndFines