Included needed headers for compiling with musl

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Upstream-Status: Inappropriate

--- fts.orig/fts.h
+++ fts/fts.h
@@ -38,6 +38,17 @@
 #ifndef	_FTS_H_
 #define	_FTS_H_
 
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
 typedef struct {
 	struct _ftsent *fts_cur;	/* current node */
 	struct _ftsent *fts_child;	/* linked list of children */