[Ada] Remove vxlink and vxaddr2line from this repository

[Pierre-Marie de Rodat]

Those tools need a dedicated repository as they're VxWorks specific and
not related with the Ada front-end.

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

2018-12-11  Jerome Lambourg  <lambourg@adacore.com>

gcc/ada/

	* vxaddr2line.adb, vxlink-bind.adb, vxlink-bind.ads,
	vxlink-link.adb, vxlink-link.ads, vxlink-main.adb, vxlink.adb,
	vxlink.ads: Remove.
	* gcc-interface/Make-lang.in, gcc-interface/Makefile.in: Remove
	bits for vxaddr2line.
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