Fixed failing tests rpl_semi_sync_skip_repl.test

Removed not used have_semisync_plugin.inc

mysql-test/include/have_semisync_plugin.inc

-#
-# Check if server has support for loading plugins
-#
-if (`SELECT @@have_dynamic_loading != 'YES'`) {
-  --skip Requires dynamic loading
-}
-
-#
-# Check if the variable SEMISYNC_MASTER_SO is set
-#
-if (!$SEMISYNC_MASTER_SO)
-{
-  skip Need semisync plugins;
-}
-

mysql-test/suite/rpl/t/rpl_semi_sync_skip_repl.test

@@ -6,7 +6,6 @@
 # lost such events.
 # The test verifies the fixes' correctness simulating the 2GB offset.
 
-source include/have_semisync.inc;
 source include/not_embedded.inc;
 source include/have_innodb.inc;
 source include/have_debug.inc;