Revert "kbuild: Check if linker supports the -X option"

This reverts commit d79a2719.

According to the commit description, this ld-option test was added for
the gold linker at that time.

Commit 75959d44 ("kbuild: Fail if gold linker is detected") gave
up the gold linker support after all.

I tested the BFD linker from binutils 2.23 and LLD from LLVM 11.0.0.
Both of them support the -X option.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Makefile

@@ -1037,7 +1037,7 @@ KBUILD_LDFLAGS	+= $(call ld-option,--no-warn-rwx-segments)
 endif
 
 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
-LDFLAGS_vmlinux	+= $(call ld-option, -X,)
+LDFLAGS_vmlinux	+= -X
 endif
 
 ifeq ($(CONFIG_RELR),y)