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

fusl/src/time/time_impl.h

Index: fusl/src/time/time_impl.h
diff --git a/fusl/src/time/time_impl.h b/fusl/src/time/time_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..2e9a2c096e0fc0036afc8758dc6bb2c1b5814eff
--- /dev/null
+++ b/fusl/src/time/time_impl.h
@@ -0,0 +1,9 @@
+#include <time.h>
+
+int __days_in_month(int, int);
+int __month_to_secs(int, int);
+long long __year_to_secs(long long, int *);
+long long __tm_to_secs(const struct tm *);
+int __secs_to_tm(long long, struct tm *);
+void __secs_to_zone(long long, int, int *, long *, long *, const char **);
+const unsigned char *__map_file(const char *, size_t *);