[PATCH 4/5] over*: use v5.10.1, drop warnings

[Eric Wong <e@yhbt.net>]

v5.10.1 lets us use the lighter parent.pm instead of base.pm,
and we'll rely on the shebang to enable warnings (or not).

While we're in the area, drop a no-longer-necessary import for
PublicInbox::Search, since OverIdx doesn't require search.
---
 lib/PublicInbox/Over.pm    | 2 +-
 lib/PublicInbox/OverIdx.pm | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm
index 6b7d5216..0957cbdd 100644
--- a/lib/PublicInbox/Over.pm
+++ b/lib/PublicInbox/Over.pm
@@ -6,7 +6,7 @@
 # tweaked/updated over time and rebuilt.
 package PublicInbox::Over;
 use strict;
-use warnings;
+use v5.10.1;
 use DBI;
 use DBD::SQLite;
 use PublicInbox::Smsg;
diff --git a/lib/PublicInbox/OverIdx.pm b/lib/PublicInbox/OverIdx.pm
index 512c5f46..67f8cf65 100644
--- a/lib/PublicInbox/OverIdx.pm
+++ b/lib/PublicInbox/OverIdx.pm
@@ -9,14 +9,13 @@
 # are denoted by a negative NNTP article number.
 package PublicInbox::OverIdx;
 use strict;
-use warnings;
-use base qw(PublicInbox::Over);
+use v5.10.1;
+use parent qw(PublicInbox::Over);
 use IO::Handle;
 use DBI qw(:sql_types); # SQL_BLOB
 use PublicInbox::MID qw/id_compress mids_for_index references/;
 use PublicInbox::Smsg qw(subject_normalized);
 use Compress::Zlib qw(compress);
-use PublicInbox::Search;
 use Carp qw(croak);
 
 sub dbh_new {