common: update bluelib api usage

common/include/ivy/file.h

@@ -1,15 +1,14 @@
 #ifndef IVY_COMMON_FILE_H_
 #define IVY_COMMON_FILE_H_
 
+#include <blue/ds/array.h>
 #include <ivy/line-source.h>
 #include <ivy/misc.h>
 #include <stdio.h>
 
-struct b_array;
-
 struct ivy_file {
 	struct ivy_line_source f_base;
-	struct b_array *f_lines;
+	b_array *f_lines;
 	char *f_path;
 	FILE *f_fp;
 };