Fixed core dump in --help


include/heap.h:
  Removed a wrong character (ascii 0xa0), which looked like a space.
  This will cause some debuggers display the source code in a wrong
  way. May cut the rest of the file off and looks like a debugger
  problem, which it isn't.
mysys/my_getopt.c:
  Removed a wrong character (ascii 0xa0), which looked like a space.
  This will cause some debuggers display the source code in a wrong
  way. May cut the rest of the file off and looks like a debugger
  problem, which it isn't.
sql/mysqld.cc:
  Wrong type.