Update Musl Libc code

We now have implement all of Musl's localization code, the same way that
Musl implements localization. You may need setlocale(LC_ALL, "C.UTF-8"),
just in case anything stops working as expected.

third_party/musl/catgets.c

@@ -31,6 +31,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <errno.h>
+__static_yoink("musl_libc_notice");
 
 #define V(p) be32toh(*(uint32_t *)(p))