hp_test2 now works again
Fixed wrong cast, which caused problems with gcc 4.0 and floats in prepared statements (Bug #19694)


heap/hp_test1.c:
  Portability fix
heap/hp_test2.c:
  Added max_table_size (fixes that hp_test2 works again)
include/my_global.h:
  Fixed wrong cast, which caused problems with gcc 4.0 (Bug #19694)
mysys/my_handler.c:
  Added missing include file
strings/strtod.c:
  Fixed include files