x86: drop stack-alignment plugin opt

Now that the minimum supported version of LLVM for building the kernel has
been bumped to 13.0.1, the inner ifeq statement is always false, as the
build will fail during the configuration stage for older LLVM versions.

This effectively reverts part of commit b33fff07e3e3 ("x86, build: allow
LTO to be selected") and its follow up fix, commit 2398ce80152a ("x86,
lto: Pass -stack-alignment only on LLD < 13.0.0").

Link: https://lkml.kernel.org/r/20240125-bump-min-llvm-ver-to-13-0-1-v1-3-f5ff9bda41c5@kernel.org
Signed-off-by: Nathan Chancellor <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: "Aneesh Kumar K.V (IBM)" <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Borislav Petkov (AMD) <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Conor Dooley <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: "Naveen N. Rao" <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Nicolas Schier <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Russell King <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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