upgrade to musl 1.1.24

[andrewrk]

We have a few outstanding patches against musl as well; make sure these patches are in this new release, or otherwise remind upstream to merge them.

1.1.24 release notes

new features:

• GLOB_TILDE extension to glob
• non-stub catgets localization API, using netbsd binary catalog format
• posix_spawn file actions for [f]chdir (extension, pending future standard)
• secure_getenv function (extension)
• copy_file_range syscall wrapper (Linux extension)
• header-level support for new linux features in 5.2

performance:

• new fast path for lrint (generic C version) on 32-bit archs

major internal changes:

• functions involving time are overhauled to be time64-ready in 32-bit archs
• x32 uses the new time64 code paths to replace nasty hacks in syscall glue

compatibility & conformance:

• support for powerpc[64] unaligned relocation types
• powerpc[64] and sh sys/user.h no longer clash with kernel asm/ptrace.h
• select no longer modifies timeout on failure (or at all)
• mips64 stat results are no longer limited to 32-bit time range
• optreset (BSD extension) now has a public declaration
• support for clang inconsistencies in wchar_t type vs some 32-bit archs
• mips r6 syscall asm no longer has invalid lo/hi register clobbers
• vestigial asm declarations of __tls_get_new are removed (broke some tooling)
• riscv64 mcontext_t mismatch glibc's member naming is corrected

bugs fixed:

• glob failed to match broken symlinks consistently
• invalid use of interposed calloc to allocate initial TLS
• various dlsym symbol resolution logic errors
• semctl with SEM_STAT_ANY didn't work
• pthread_create with explicit scheduling was subject to priority inversion
• pthread_create failure path had data race for thread count
• timer_create with SIGEV_THREAD notification had data race getting timer id
• wide printf family failed to support l modifier for float formats

arch-specific bugs fixed:

• x87 floating point stack imbalance in math asm (i386-only CVE-2019-14697)
• x32 clock_adjtime, getrusage, wait3, wait4 produced junk (struct mismatches)
• lseek broken on x32 and mipsn32 with large file offsets
• riscv64 atomics weren't compiler barriers
• riscv64 atomics had broken asm constraints (missing earlyclobber flag)
• arm clone() was broken when compiled as thumb if start function returned
• mipsr6 setjmp/longjmp did not preserve fpu register state correctly