Fix plugin boolean variables to receive the value "1", not "-1", when they
are set to 1.  Aside from being bizarre, the existing behavior is unportable:
machines where char is unsigned print "255" instead.  Filed upstream at
http://bugs.mysql.com/bug.php?id=59905
Filed upstream at https://bugs.launchpad.net/maria/+bug/886479


diff -Naur 5.5_orig/sql/sql_plugin.cc 5.5/sql/sql_plugin.cc
--- 5.5_orig/sql/sql_plugin.cc	2011-11-01 16:20:49.000000000 +0100
+++ 5.5/sql/sql_plugin.cc	2011-11-05 10:39:05.574604026 +0100
@@ -2285,7 +2285,7 @@
       goto err;
     result= (int) tmp;
   }
-  *(my_bool *) save= -result;
+  *(my_bool *) save= result ? true : false;
   return 0;
 err:
   return 1;
diff -Naur 5.5_orig/mysql-test/suite/sys_vars/r/rpl_semi_sync_master_enabled_basic.result 5.5/mysql-test/suite/sys_vars/r/rpl_semi_sync_master_enabled_basic.result
--- 5.5_orig/mysql-test/suite/sys_vars/r/rpl_semi_sync_master_enabled_basic.result	2011-11-01 16:20:49.000000000 +0100
+++ 5.5/mysql-test/suite/sys_vars/r/rpl_semi_sync_master_enabled_basic.result	2011-11-05 10:39:05.654604133 +0100
@@ -45,7 +45,7 @@
 ERROR HY000: Variable 'rpl_semi_sync_master_enabled' is a GLOBAL variable and should be set with SET GLOBAL
 select @@global.rpl_semi_sync_master_enabled;
 @@global.rpl_semi_sync_master_enabled
--1
+1
 select @@session.rpl_semi_sync_master_enabled;
 ERROR HY000: Variable 'rpl_semi_sync_master_enabled' is a GLOBAL variable
 show global variables like 'rpl_semi_sync_master_enabled';
diff -Naur 5.5_orig/mysql-test/suite/sys_vars/r/rpl_semi_sync_slave_enabled_basic.result 5.5/mysql-test/suite/sys_vars/r/rpl_semi_sync_slave_enabled_basic.result
--- 5.5_orig/mysql-test/suite/sys_vars/r/rpl_semi_sync_slave_enabled_basic.result	2011-11-01 16:20:49.000000000 +0100
+++ 5.5/mysql-test/suite/sys_vars/r/rpl_semi_sync_slave_enabled_basic.result	2011-11-05 10:39:05.693604115 +0100
@@ -45,7 +45,7 @@
 ERROR HY000: Variable 'rpl_semi_sync_slave_enabled' is a GLOBAL variable and should be set with SET GLOBAL
 select @@global.rpl_semi_sync_slave_enabled;
 @@global.rpl_semi_sync_slave_enabled
--1
+1
 select @@session.rpl_semi_sync_slave_enabled;
 ERROR HY000: Variable 'rpl_semi_sync_slave_enabled' is a GLOBAL variable
 show global variables like 'rpl_semi_sync_slave_enabled';