musl: Update to tip of trunk

This brings in following changes

* 7d756e1c (upstream/master, origin/master) dns: prefer monotonic clock for timeouts
* 07616721 fix return value of wcs{,n}cmp for extreme wchar_t values
* 35fdfe62 math: fix undefined shift in logf
* 7e13e5ae inet_pton: fix uninitialized memory use for IPv4-mapped IPv6 addresses
* 7e6da7ac hsearch: fix null pointer arithmetic UB
* f79b973d increase sendmsg internal buffer to support SCM_MAX_FD
* 0ab97350 mq_notify: block all (application) signals in the worker thread
* 711673ee mq_notify: join worker thread before returning in error path
* 8c0c9c69 mq_notify: rework to fix use-after-close/double-close bugs
* fde6891e mq_notify: use semaphore instead of barrier to sync args consumption
* c3cd04fa fix pthread_detach inadvertently acting as cancellation point in race case
* 115149c0 powerpc-sf longjmp clobbering of val argument
* 5763f003 riscv64: add vfork
* 269d1938 fix wrong sigaction syscall ABI on mips*, or1k, microblaze, riscv64
* ea3b40a3 fix integer overflow in WIFSTOPPED macro
* f897461d fix debugger tracking of shared libraries on mips with PIE main program
* a4b0a665 expose memmem under baseline POSIX feature profile
* 9532ae13 use libc-internal malloc for pthread_atfork
* 7d358599 prevent invalid reads of nl_arg in printf_core
* c5f4b2df elf.h: add ELFCOMPRESS_ZSTD
* 159d1f6c semaphores: fix missed wakes from ABA bug in waiter count logic

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