ada: Set Support_Atomic_Primitives for VxWorks 7 runtimes

ada: Set Support_Atomic_Primitives for VxWorks 7 runtimes

gcc/ada/

	* libgnat/system-vxworks7-aarch64-rtp-smp.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-aarch64.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-arm-rtp-smp.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-arm.ads: Set Support_Atomic_Primitives
	to True.
	* libgnat/system-vxworks7-ppc-kernel.ads: Set
	Support_Atomic_Primitives to False.
	* libgnat/system-vxworks7-ppc-rtp-smp.ads: Set
	Support_Atomic_Primitives to False.
	* libgnat/system-vxworks7-ppc64-kernel.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-ppc64-rtp-smp.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-x86-kernel.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-x86-rtp-smp.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-x86_64-kernel.ads: Set
	Support_Atomic_Primitives to True.
	* libgnat/system-vxworks7-x86_64-rtp-smp.ads: Set
	Support_Atomic_Primitives to True.