toolchain: Update glibc 2.34 to recent HEAD

toolchain: Update glibc 2.34 to recent HEAD

This adds the following changes:
a88f07f71f stdlib: Remove attr_write from mbstows if dst is NULL [BZ: 29265]
4bc889c01c stdlib: Fixup mbstowcs NULL __dst handling. [BZ #29279]
1fcc7bfee2 alpha: Fix generic brk system call emulation in __brk_call (bug 29490)
68507377f2 socket: Check lengths before advancing pointer in CMSG_NXTHDR
536ddc5c02 elf: Call __libc_early_init for reused namespaces (bug 29528)
2a44960cbc Apply asm redirections in stdio.h before first use [BZ #27087]
b41c535f46 Apply asm redirections in wchar.h before first use
2b3d020055 nscd: Fix netlink cache invalidation if epoll is used [BZ #29415]
bc5cb538e5 elf: Run tst-audit-tlsdesc, tst-audit-tlsdesc-dlopen everywhere
2ff6775ad3 elf: Fix hwcaps string size overestimation
f50a6c843a gconv: Use 64-bit interfaces in gconv_parseconfdir (bug 29583)
1a3afdfe31 resolv: Add tst-resolv-byaddr for testing reverse lookup
6a833d798e resolv: Add tst-resolv-aliases
4d2e67d6e5 resolv: Add internal __res_binary_hnok function
bb8adbba4f resolv: Add the __ns_samebinaryname function
c288e032ae resolv: Add internal __ns_name_length_uncompressed function
e7c03f4765 resolv: Add DNS packet parsing helpers geared towards wire format
d9c979abf9 nss_dns: Split getanswer_ptr from getanswer_r
32e5db3768 nss_dns: Rewrite _nss_dns_gethostbyaddr2_r and getanswer_ptr
7267341ec1 nss_dns: Remove remnants of IPv6 address mapping
9abc40d9b5 nss_dns: Rewrite getanswer_r to match getanswer_ptr (bug 12154, bug 29305)
c36e7cca35 nss_dns: In gaih_getanswer_slice, skip strange aliases (bug 12154)
480c820493 resolv: Add new tst-resolv-invalid-cname
2def56a349 nss_dns: Rewrite _nss_dns_gethostbyname4_r using current interfaces
044755e2fa resolv: Fix building tst-resolv-invalid-cname for earlier C standards
a2e259014f Avoid extra load with CAS in __pthread_mutex_lock_full [BZ #28537]
ed8300c054 Avoid extra load with CAS in __pthread_mutex_clocklock_common [BZ #28537]
a6b81f605d Add LLL_MUTEX_READ_LOCK [BZ #28537]
6bcfbee727 Move assignment out of the CAS condition
43760d33d7 nptl: Effectively skip CAS in spinlock loop
04efdcfac4 sysdeps: Add 'get_fast_jitter' interace in fast-jitter.h
ea69248445 nptl: Add backoff mechanism to spinlock loop
95f5089d4a x86: include BMI1 and BMI2 in x86-64-v3 level
414fc856ff x86-64: Require BMI2 for AVX2 str(n)casecmp implementations
e1561d8cf0 x86-64: Require BMI2 for AVX2 strcmp implementation
b9cbb8dd48 x86-64: Require BMI2 for AVX2 strncmp implementation
67e863742d x86-64: Require BMI2 for AVX2 wcs(n)cmp implementations
94b9c1b640 x86-64: Require BMI2 for AVX2 (raw|w)memchr implementations
36d6b9be3d x86-64: Require BMI2 and LZCNT for AVX2 memrchr implementation
e570b865b5 x86-64: Require BMI1/BMI2 for AVX2 strrchr and wcsrchr implementations
e3976287b2 nscd: Drop local address tuple variable [BZ #29607]
c95ef423d7 nss: Implement --no-addrconfig option for getent
16c7ed6e68 nss: Fix tst-nss-files-hosts-long on single-stack hosts (bug 24816)
d5313bcb7e nss: Use shared prefix in IPv4 address in tst-reload1
9f55d2e7c4 elf: Do not completely clear reused namespace in dlmopen (bug 29600)
ca5df79545 linux: Fix generic struct_stat for 64 bit time (BZ# 29657)
f42d871b22 Makerules: fix MAKEFLAGS assignment for upcoming make-4.4 [BZ# 29564]
675ba1f361 mktime: improve heuristic for ca-1986 Indiana DST
6e8044e910 Fix memmove call in vfprintf-internal.c:group_number
291d440206 Allow #pragma GCC in headers in conformtest
86a701a204 regex: copy back from Gnulib
fa5044f1e3 regex: fix buffer read overrun in search [BZ#28470]
06afa5e09f io: Fix ftw internal realloc buffer (BZ #28126)
deea6ab1bc io: Fix use-after-free in ftw [BZ #26779]
d57cdc1b5a Linux: Support __IPC_64 in sysvctl *ctl command arguments (bug 29771)
75b0edb7ef Update NEWS file in the right place
691f70b84a elf: Fix rtld-audit trampoline for aarch64
e3255e7d21 x86: Fix wcsnlen-avx2 page cross length comparison [BZ #29591]
309c4708ac elf: Fix wrong fscanf usage on tst-pldd
42b9d7def8 Allow for unpriviledged nested containers
405b8ae135 elf: Fix wrong fscanf usage on tst-pldd
a1c12fdf3f _Static_assert needs two arguments for compatibility with GCC before 9
a4217408a3 Apply asm redirections in syslog.h before first use [BZ #27087]

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>