build: Remove HAVE_LD_EH_FRAME_CIEV3

build: Remove HAVE_LD_EH_FRAME_CIEV3

Old versions of Solaris ld and GNU ld didn't support CIEv3 in .eh_frame.
To avoid this breaking the build

	[build] Default to DWARF 4 on Solaris if linker supports CIEv3
	http://gcc.gnu.org/ml/gcc-patches/2013-03/msg00669.html

checked for the necessary linker support, defaulting to DWARF-2 if
necessary.  Solaris ld was fixed in Solaris 11.1, GNU ld in binutils
2.16, so this is long obsolete and only used in Solaris code anyway.

This patch thus removes both the configure check and
solaris_override_options.

Bootstrapped without regressions on i386-pc-solaris2.11 and
sparc-sun-solaris2.11.

2025-02-12  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* configure.ac (gcc_cv_ld_eh_frame_ciev3): Remove.
	* configure, config.in: Regenerate.
	* config/sol2.cc (solaris_override_options): Remove.
	* config/sol2.h (SUBTARGET_OVERRIDE_OPTIONS): Remove.
	* config/sol2-protos.h (solaris_override_options): Remove.