In response to [ 689702 ] Missing C99 __func__ predefined identifier

 Added  the __func__ identifier from C99
  Not this won't follow the same semantics as
  __func__ in C99

  FWIW C99 says that __func__ should have the value of the
  lexically enclosing function
  e.g. in the function foo __func__ == "foo"
  in bar __func__ == "bar"

  We're just having the value be constant here and picking
  an arbitary value.