Move elements() to nasmlib.h

Move elements() to nasmlib.h; that is the best place for this kind of
utility macros.

nasm.h

@@ -961,19 +961,6 @@ enum special_tokens {
     SPECIAL_ENUM_LIMIT
 };
 
-/*
- * -----
- * Other
- * -----
- */
-
-/*
- * This is a useful #define which I keep meaning to use more often:
- * the number of elements of a statically defined array.
- */
-
-#define elements(x)     ( sizeof(x) / sizeof(*(x)) )
-
 /*
  * -----
  * Global modes

nasmlib.h

@@ -162,6 +162,16 @@ void standard_extension(char *inname, char *outname, char *extension,
                         efunc error);
 #endif
 
+/*
+ * Utility macros...
+ *
+ * This is a useful #define which I keep meaning to use more often:
+ * the number of elements of a statically defined array.
+ */
+
+#define elements(x)     ( sizeof(x) / sizeof(*(x)) )
+
+
 /*
  * some handy macros that will probably be of use in more than one
  * output format: convert integers into little-endian byte packed