REORG: include: move mworker.h to haproxy/mworker{,-t}.h

One function prototype makes reference to struct mworker_proc which was
not defined there but in global.h instead. This definition, along with
the PROC_O_* fields were moved to mworker-t.h instead.
diff --git a/src/mworker-prog.c b/src/mworker-prog.c
index 4951063..0a448be 100644
--- a/src/mworker-prog.c
+++ b/src/mworker-prog.c
@@ -23,9 +23,9 @@
 #include <haproxy/api.h>
 #include <common/cfgparse.h>
 #include <haproxy/errors.h>
+#include <haproxy/mworker.h>
 
 #include <proto/log.h>
-#include <proto/mworker.h>
 
 static int use_program = 0; /* do we use the program section ? */