Portability fix in safemalloc.c


libmysqld/lib_sql.cc:
  Removed not needed define
myisam/sort.c:
  Fixed core dump crash in repair table.
mysql-test/r/myisam.result:
  Test for repair table
mysql-test/t/myisam.test:
  Test for repair table
mysys/safemalloc.c:
  Portability fix