Skip tests t/60leaks.t and t/rt86153-reconnect-fail-memory.t on OpenBSD

These two tests are failing on OpenBSD system when measuring system memory
and report memory leaks. Probably there are no memory leaks just higher
consumption of system resources by memory allocator itself.

As there are no known memory problems with DBD::MariaDB on OpenBSD systems
and nobody is able to debug them, disable those tests on OpenBSD for now.

t/60leaks.t

@@ -28,6 +28,8 @@ if (!$have_pt_size) {
         plan skip_all => "module Proc::ProcessTable does not support size attribute on current platform\n";
 }
 
+plan skip_all => 'this test is not supported on OpenBSD platform' if $^O eq 'openbsd';
+
 my ($dbh, $sth);
 $dbh = DbiTestConnect($test_dsn, $test_user, $test_password,
                                             { RaiseError => 1, PrintError => 1, AutoCommit => 0 });

t/rt86153-reconnect-fail-memory.t

@@ -26,6 +26,8 @@ if (!$have_pt_size) {
     plan skip_all => "module Proc::ProcessTable does not support size attribute on current platform\n";
 }
 
+plan skip_all => 'this test is not supported on OpenBSD platform' if $^O eq 'openbsd';
+
 my $dbh = DbiTestConnect($test_dsn, $test_user, $test_password, { RaiseError => 1, PrintError => 1, AutoCommit => 1 });
 
 plan tests => 3;