[Ada] Unix Epochalypse (s-osprim.adb)

[Pierre-Marie de Rodat]

System.OS_Primitives in libgnat for VxWorks imports Ssystem.OS_Interface
in libgnarl, creating a dependency on libgnarl by libgnat. This works as
long as the functions being referenced in OS_Primitives were pragma
imported functions from the kernel, but this is no longer the case with
a selectable time_t size.  Rather than port yet another package, we
switch to s-osprim__posix.adb which works out-of-the-box for vxworks7r2,
the only release currently supported on wavefront.

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

gcc/ada/

	* Makefile.rtl (LIBGNAT_TARGET_PAIRS): Use s-osprim__posix.adb
	vice s-osprim__vxworks.adb for all vxworks7r2 targets.
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