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

fusl/src/time/getdate.c

+#include <time.h>
+#include <pthread.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int getdate_err;
+
+struct tm *getdate(const char *s)
+{
+        static struct tm tmbuf;
+        struct tm *ret = 0;
+        char *datemsk = getenv("DATEMSK");
+        FILE *f = 0;
+        char fmt[100], *p;
+        int cs;
+
+        pthread_setcancelstate(PTHREAD_CANCEL_DEFERRED, &cs);
+
+        if (!datemsk) {
+                getdate_err = 1;
+                goto out;
+        }
+
+        f = fopen(datemsk, "rbe");
+        if (!f) {
+                if (errno == ENOMEM) getdate_err = 6;
+                else getdate_err = 2;
+                goto out;
+        }
+
+        while (fgets(fmt, sizeof fmt, f)) {
+                p = strptime(s, fmt, &tmbuf);
+                if (p && !*p) {
+                        ret = &tmbuf;
+                        goto out;
+                }
+        }
+
+        getdate_err = 7;
+out:
+        if (f) fclose(f);
+        pthread_setcancelstate(cs, 0);
+        return ret;
+}