srcpos: Remove srcpos_empty

Nothing was actually using it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

srcpos.c

@@ -197,18 +197,6 @@ void srcfile_add_search_path(const char *dirname)
 	search_path_tail = &node->next;
 }
 
-/*
- * The empty source position.
- */
-
-struct srcpos srcpos_empty = {
-	.first_line = 0,
-	.first_column = 0,
-	.last_line = 0,
-	.last_column = 0,
-	.file = NULL,
-};
-
 void srcpos_update(struct srcpos *pos, const char *text, int len)
 {
 	int i;

srcpos.h

@@ -96,13 +96,6 @@ struct srcpos {
 	} while (0)
 
 
-/*
- * Fictional source position used for IR nodes that are
- * created without otherwise knowing a true source position.
- * For example,constant definitions from the command line.
- */
-extern struct srcpos srcpos_empty;
-
 extern void srcpos_update(struct srcpos *pos, const char *text, int len);
 extern struct srcpos *srcpos_copy(struct srcpos *pos);
 extern char *srcpos_string(struct srcpos *pos);