Vendor dependencies for 0.3.0 release

vendor/walkdir/compare/nftw.c

@@ -0,0 +1,25 @@
+#define _XOPEN_SOURCE 500
+#include <ftw.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+
+static int
+display_info(const char *fpath, const struct stat *sb,
+             int tflag, struct FTW *ftwbuf)
+{
+    printf("%s\n", fpath);
+    return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+    int flags = FTW_PHYS;
+    if (nftw((argc < 2) ? "." : argv[1], display_info, 20, flags) == -1) {
+        perror("nftw");
+        exit(EXIT_FAILURE);
+    }
+    exit(EXIT_SUCCESS);
+}