WL#5030: Splitting mysql_priv.h

Adding includes of my_global.h that seems to be necessary on Windows.

storage/perfschema/pfs.h

@@ -24,6 +24,7 @@
 #define HAVE_PSI_1
 
 #include <sql_priv.h>
+#include <my_global.h>
 #include <unireg.h>
 #include <mysql/psi/psi.h>
 

storage/perfschema/pfs_instr_class.h

@@ -39,6 +39,7 @@
 #define PFS_MAX_FULL_PREFIX_NAME_LENGTH 32
 
 #include <sql_priv.h>
+#include <my_global.h>
 #include <mysql/psi/psi.h>
 #include "pfs_lock.h"
 #include "pfs_stat.h"