The first implementation hit a front-end implementation bug where
version conditions are resolved ahead of static if confitions.
The logic for whether to use asm implemented fiber_switchContext or
libc's swapcontext has been moved from GNU_Enable_CET to version CET.
libphobos/ChangeLog:
PR d/95680
PR d/97007
* Makefile.am (AM_MAKEFLAGS): Remove $(CET_FLAGS).
* Makefile.in: Regenerate.
* configure: Regenerate.
* configure.ac (DCFG_ENABLE_CET): Remove substitution.
(CET_DFLAGS): Substitute.
* libdruntime/Makefile.am (AM_DFLAGS): Add $(CET_DFLAGS).
(AM_CFLAGS): Add $(CET_FLAGS).
(AM_CCASFLAGS): Likewise.
* libdruntime/Makefile.in: Regenerate.
* libdruntime/core/thread.d: Replace static if GNU_Enable_CET
condition with `version (CET)'.
* libdruntime/gcc/config.d.in (GNU_Enable_CET): Remove.
* src/Makefile.am (AM_DFLAGS): Add $(CET_DFLAGS).
(AM_CFLAGS): Add $(CET_FLAGS).
* src/Makefile.in: Regenerate.
* testsuite/Makefile.in: Regenerate.
* testsuite/testsuite_flags.in: Add $(CET_DFLAGS) to --gdcflags.
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