Remove _() and N_() from platform.h. #define them as NOP macros in the two

files still using them.  I didn't remove them from e2fsck.c to avoid stomping
pending cleanup patches from Garrett, and I didn't bother to remove them from
fdisk.c because that entire file needs to be rewritten from scratch.

e2fsprogs/e2fsck.c

@@ -39,6 +39,9 @@
 
 #include "e2fsck.h"	/*Put all of our defines here to clean things up*/
 
+#define _(x) x
+#define N_(x) x
+
 /*
  * Procedure declarations
  */