setenv: Rework free(environ) compatibility support (RHEL-75809)

CVE-2025-0577: vDSO getrandom predictable randomness after fork (RHEL-75555)

Restore compatibility with environ/malloc usage pattern (RHEL-75809)

Sync with upstream branch release/2.39/master,
Fix underallocation of abort_msg_s struct (CVE-2025-0395)
x86/string: Fixup alignment of main loop in str{n}cmp-evex [BZ #32212]
x86: Improve large memset perf with non-temporal stores [RHEL-29312]
x86: Avoid integer truncation with large cache sizes (bug 32470)
math: Exclude internal math symbols for tests [BZ #32414]
malloc: add indirection for malloc(-like) functions in tests [BZ #32366]
Pass -nostdlib -nostartfiles together with -r [BZ #31753]
nptl: initialize cpu_id_start prior to rseq registration
nptl: initialize rseq area prior to registration

Support in-place file conversion in the iconv tool (RHEL-71530)

Make getenv thread-safe in more cases (RHEL-42410)

Minor update to getrandom vDSO handshake

CVE-2024-12455: Incorrect getrandom return value on ppc64le

Sync with upstream branch release/2.39/master,
elf: Change ldconfig auxcache magic number (bug 32231)
Make tst-strtod-underflow type-generic
Add crt1-2.0.o for glibc 2.0 compatibility tests
Add tests of more strtod special cases
Add more tests of strtod end pointer
Make tst-strtod2 and tst-strtod5 type-generic
powerpc64le: Build new strtod tests with long double ABI flags (bug 32145)
Do not set errno for overflowing NaN payload in strtod/nan (bug 32045)
Improve NaN payload testing
Make __strtod_internal tests type-generic
Fix strtod subnormal rounding (bug 30220)
More thoroughly test underflow / errno in tst-strtod-round
Test errno setting on strtod overflow in tst-strtod-round
Add tests of fread
stdio-common: Add new test for fdopen
libio: Attempt wide backup free only for non-legacy code
debug: Fix read error handling in pcprofiledump
elf: Fix tst-dlopen-tlsreinit1.out test dependency
elf: Avoid re-initializing already allocated TLS in dlopen (bug 31717)
elf: Clarify and invert second argument of _dl_allocate_tls_init
elf: Support recursive use of dynamic TLS in interposed malloc
nptl: Use <support/check.h> facilities in tst-setuid3
posix: Use <support/check.h> facilities in tst-truncate and tst-truncate64
ungetc: Fix backup buffer leak on program exit [BZ #27821]
ungetc: Fix uninitialized read when putting into unused streams [BZ #27821]
Make tst-ungetc use libsupport
stdio-common: Add test for vfscanf with matches longer than INT_MAX [BZ #27650]
support: Add FAIL test failure helper
string: strerror, strsignal cannot use buffer after dlmopen (bug 32026)
Define __libc_initial for the static libc
x86: Fix bug in strchrnul-evex512 [BZ #32078]
Adjust check-local-headers test for libaudit 4.0
x32/cet: Support shadow stack during startup for Linux 6.10
x86-64: Remove sysdeps/x86_64/x32/dl-machine.h
support: Add options list terminator to the test driver
manual/stdio: Further clarify putc, putwc, getc, and getwc
Fix name space violation in fortify wrappers (bug 32052)
resolv: Fix tst-resolv-short-response for older GCC (bug 32042)
Add mremap tests
mremap: Update manual entry
linux: Update the mremap C implementation [BZ #31968]
Enhanced test coverage for strncmp, wcsncmp
Enhance test coverage for strnlen, wcsnlen

Add support for getrandom vDSO (RHEL-12867)

Eliminate glibc-headers and related packages

Complete Features/UsrMove (aka UsrMerge, MoveToUsr) transition (#1063607)

Rework filelist construction

Switch to the upstream way of building xtests

Bump release for October 2024 mass rebuild:
64018

Ensure that xtests can be built (RHEL-59494)