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

fusl/src/malloc/calloc.c

Index: fusl/src/malloc/calloc.c
diff --git a/fusl/src/malloc/calloc.c b/fusl/src/malloc/calloc.c
new file mode 100644
index 0000000000000000000000000000000000000000..436c0b034869a409cdc24d63adbd9be04ac5ff7e
--- /dev/null
+++ b/fusl/src/malloc/calloc.c
@@ -0,0 +1,13 @@
+#include <stdlib.h>
+#include <errno.h>
+
+void *__malloc0(size_t);
+
+void *calloc(size_t m, size_t n)
+{
+	if (n && m > (size_t)-1/n) {
+		errno = ENOMEM;
+		return 0;
+	}
+	return __malloc0(n * m);
+}