[Ada] Build support units for 128-bit integer types on 64-bit platforms

[Pierre-Marie de Rodat]

This enables the build of the support units for 128-bit integer types
in the full runtime of 64-bit platforms.

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

gcc/ada/

	* Makefile.rtl (64-bit platforms): Add GNATRTL_128BIT_PAIRS to
	the LIBGNAT_TARGET_PAIRS list and also GNATRTL_128BIT_OBJS to
	the EXTRA_GNATRTL_NONTASKING_OBJS list.
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