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:
  Fix of broken 4.1 tree: 
  - my_time.c was added to link_sources target.