[Ada] aarch64-rtems6: use wraplf variant for a-nallfl

[Pierre-Marie de Rodat]

Since newlib doesn't implement correctly long double, use the wraplf
variant for a-nallfl.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* Makefile.rtl (LIBGNAT_TARGET_PAIRS) <aarch64*-*-rtems*>: Use
	the wraplf variant of Aux_Long_Long_Float.
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