Add a "fork" of musl as //fusl.

fusl/include/getopt.h

Index: fusl/include/getopt.h
diff --git a/fusl/include/getopt.h b/fusl/include/getopt.h
new file mode 100644
index 0000000000000000000000000000000000000000..c1d0df928f749ac0f3094b80f2422abce23b2dfa
--- /dev/null
+++ b/fusl/include/getopt.h
@@ -0,0 +1,31 @@
+#ifndef _GETOPT_H
+#define _GETOPT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int getopt(int, char * const [], const char *);
+extern char *optarg;
+extern int optind, opterr, optopt, optreset;
+
+struct option
+{
+	const char *name;
+	int has_arg;
+	int *flag;
+	int val;
+};
+
+int getopt_long(int, char *const *, const char *, const struct option *, int *);
+int getopt_long_only(int, char *const *, const char *, const struct option *, int *);
+
+#define no_argument        0
+#define required_argument  1
+#define optional_argument  2
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif