* ldgram.y: map -M behave in the same way as -Map (sets file name

	* ldgram.y: map -M behave in the same way as -Map (sets file name
	to be "-".
	* ldsym.c, ldlang.c: remember that size of a section is dependent on
	whether or not relaxing has been done.
	* ldmain.c: don't open a map file if it doesn't have a name
	* relax.c: all the brains have moved into bfd.
	* ldwrite.c: ammend comment