manual: Do not mention STATIC_TLS in dynamic linker hardening recommendations
The current toolchain does not consistently generate it, and
glibc does not use it.
Reviewed-by: 
Szabolcs Nagy <szabolcs.nagy@arm.com>
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The current toolchain does not consistently generate it, and
glibc does not use it.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>