Fix of broken 4.1 tree:

Initially my_time.c was added to sql/ link_sources target only.
As it turns out this target is sometimes not called; instead of it
make calls one hard-coded in top-level Makefile.am.
Now adding linking of my_time.c to the top-level Makefile.am
to (hopefully) cover all cases.

Makefile.am

@@ -71,7 +71,8 @@ linked_server_sources:
 	cd sql; rm -f mini_client_errors.c;\
 		@LN_CP_F@ ../libmysql/errmsg.c mini_client_errors.c;\
 		rm -f pack.c;@LN_CP_F@ ../sql-common/pack.c pack.c;\
-		rm -f client.c;@LN_CP_F@ ../sql-common/client.c client.c
+		rm -f client.c;@LN_CP_F@ ../sql-common/client.c client.c\
+		rm -f my_time.c;@LN_CP_F@ ../sql-common/my_time.c my_time.c
 	echo timestamp > linked_server_sources
 
 # Create permission databases