musl: Update to latest master

Brings the following changes

* b928c723 fix return value of wmemcmp for extreme wchar_t values
* 4724793f fix wide printf numbered argument buffer overflow
* c1b42c4a wait4: fix missing rusage on x32 due to wrong success condition
* 9b12982d semtimedop: fix timespec kernel ABI mismatch for 32-bit timeouts on x32
* 6d322159 getopt: fix null pointer arithmetic ub
* 35e98311 nftw: fix use of uninitialized struct stat
* 7c410472 fix inadvertently static local var in dynlink get_lfs64
* 77327ed0 dns: check length field in tcp response message

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>