[glibc] arm: Use have-mtls-dialect-gnu2 to check for ARM TLS descriptors support

[glibc] arm: Use have-mtls-dialect-gnu2 to check for ARM TLS descriptors support

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=613cb5c7b19816c6ff844be7afc9faf574f834fd

commit 613cb5c7b19816c6ff844be7afc9faf574f834fd
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Oct 28 08:15:10 2021 -0300

    arm: Use have-mtls-dialect-gnu2 to check for ARM TLS descriptors support
    
    The lld linker does not support TLSDESC for arm.  The have-arm-tls-desc
    is a leftover of 56583289b1 to support NaCL.
    
    Reviewed-by: Fangrui Song <maskray@google.com>

Diff:
---
 sysdeps/arm/Makefile | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/sysdeps/arm/Makefile b/sysdeps/arm/Makefile
index fb4164f0d9..da4226c8c8 100644
--- a/sysdeps/arm/Makefile
+++ b/sysdeps/arm/Makefile
@@ -1,11 +1,6 @@
 gnulib-arch = $(elf-objpfx)libgcc-stubs.a
 static-gnulib-arch = $(elf-objpfx)libgcc-stubs.a
 
-# All supported build tools support TLS descriptors, but the OS may not.
-ifndef have-arm-tls-desc
-have-arm-tls-desc = yes
-endif
-
 ifeq ($(subdir),elf)
 sysdep-dl-routines += tlsdesc dl-tlsdesc
 sysdep_routines += aeabi_unwind_cpp_pr1 find_exidx
@@ -18,7 +13,7 @@ $(objpfx)libgcc-stubs.a: $(objpfx)aeabi_unwind_cpp_pr1.os
 lib-noranlib: $(objpfx)libgcc-stubs.a
 
 ifeq ($(build-shared),yes)
-ifeq ($(have-arm-tls-desc),yes)
+ifeq (yes,$(have-mtls-dialect-gnu2))
 tests += tst-armtlsdescloc tst-armtlsdescextnow tst-armtlsdescextlazy
 modules-names += tst-armtlsdesclocmod
 modules-names += tst-armtlsdescextlazymod tst-armtlsdescextnowmod