Portability fix (For Mac OS X)


configure.in:
  Added detection of malloc / sys/malloc
include/my_pthread.h:
  Safety fix to detect multiple calls to my_thread_end()
libmysqld/lib_sql.cc:
  Remove duplicate call to my_thread_end()
mysys/charset.c:
  Cleanup indentation
  Remove some short variable names
mysys/my_thr_init.c:
  Safety fix to detect multiple calls to my_thread_end()
sql/sql_test.cc:
  Portability fix (For Mac OS X)