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

fusl/src/ldso/tlsdesc.c

Index: fusl/src/ldso/tlsdesc.c
diff --git a/fusl/src/ldso/tlsdesc.c b/fusl/src/ldso/tlsdesc.c
new file mode 100644
index 0000000000000000000000000000000000000000..4bc654fa5cbf4c11de62c88270ca9ca0baa52684
--- /dev/null
+++ b/fusl/src/ldso/tlsdesc.c
@@ -0,0 +1,16 @@
+#ifdef SHARED
+
+#include <stddef.h>
+#include "libc.h"
+
+__attribute__((__visibility__("hidden")))
+ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic();
+
+ptrdiff_t __tlsdesc_static()
+{
+	return 0;
+}
+
+weak_alias(__tlsdesc_static, __tlsdesc_dynamic);
+
+#endif