x86: Enable TLS relocation check only for ELF

x86: Enable TLS relocation check only for ELF

Since TLS relocation check is ELF specific, enable it only for ELF.

	PR gas/32022
	* config/tc-i386.c (x86_tls_error_type): Define only if
	OBJ_MAYBE_ELF or OBJ_ELF is defined.
	(x86_check_tls_relocation): Likewise.
	(x86_report_tls_error): Likewise.
	(i386_assemble): Check TLS relocations only if OBJ_MAYBE_ELF or
	OBJ_ELF is defined.
	(md_show_usage): Output -mtls-check= only if OBJ_MAYBE_ELF or
	OBJ_ELF is defined.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>