When linking with some external programs, "multiple definition 
of `init_time'"

Rename init_time() to my_init_time() to avoid collision with other
libraries (particularly libmng).


client/mysqlbinlog.cc:
  Rename init_time() to my_init_time().
include/my_time.h:
  Rename init_time() to my_init_time().
sql-common/my_time.c:
  Rename init_time() to my_init_time().
sql/init.cc:
  Rename init_time() to my_init_time().
sql/tztime.cc:
  Rename init_time() to my_init_time().