This constant has been unused for ages.  The corresponding getter function
is also removed from the Get_Targ package, but the corresponding constant
declared in Set_Targ is preserved for the sake of backward compatibility
of the target file format.

gcc/ada/

	* get_targ.ads (Get_Max_Unaligned_Field): Delete.
	* ada_get_targ.adb (Get_Max_Unaligned_Field): Likewise.
	* get_targ.adb (Get_Max_Unaligned_Field): Likewise.
	* set_targ.ads (Max_Unaligned_Field): Adjust comment.
	* set_targ.adb: Set Max_Unaligned_Field to 1 during elaboration.
	* ttypes.ads (Max_Unaligned_Field): Delete.