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

fusl/src/stdio/__toread.c

Index: fusl/src/stdio/__toread.c
diff --git a/fusl/src/stdio/__toread.c b/fusl/src/stdio/__toread.c
new file mode 100644
index 0000000000000000000000000000000000000000..b08f5bb440345efefc5dd0f4d8679e0a56eb91e0
--- /dev/null
+++ b/fusl/src/stdio/__toread.c
@@ -0,0 +1,21 @@
+#include <stdio_impl.h>
+
+int __toread(FILE *f)
+{
+	f->mode |= f->mode-1;
+	if (f->wpos > f->buf) f->write(f, 0, 0);
+	f->wpos = f->wbase = f->wend = 0;
+	if (f->flags & F_NORD) {
+		f->flags |= F_ERR;
+		return EOF;
+	}
+	f->rpos = f->rend = f->buf + f->buf_size;
+	return (f->flags & F_EOF) ? EOF : 0;
+}
+
+void __stdio_exit_needed(void);
+
+void __toread_needs_stdio_exit()
+{
+	__stdio_exit_needed();
+}