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

fusl/src/stdio/__stdout_write.c

Index: fusl/src/stdio/__stdout_write.c
diff --git a/fusl/src/stdio/__stdout_write.c b/fusl/src/stdio/__stdout_write.c
new file mode 100644
index 0000000000000000000000000000000000000000..dd1ec60ff703475120251bf9a005874aafa9ae74
--- /dev/null
+++ b/fusl/src/stdio/__stdout_write.c
@@ -0,0 +1,11 @@
+#include "stdio_impl.h"
+#include <sys/ioctl.h>
+
+size_t __stdout_write(FILE *f, const unsigned char *buf, size_t len)
+{
+	struct winsize wsz;
+	f->write = __stdio_write;
+	if (!(f->flags & F_SVB) && __syscall(SYS_ioctl, f->fd, TIOCGWINSZ, &wsz))
+		f->lbf = -1;
+	return __stdio_write(f, buf, len);
+}