[Ada] Bump copyright notices to 2018

[Ada] Bump copyright notices to 2018

2018-08-21  Pierre-Marie de Rodat  <derodat@adacore.com>

gcc/ada/

	* libgnarl/a-intnam__dragonfly.ads,
	libgnarl/s-osinte__dragonfly.adb,
	libgnarl/s-osinte__dragonfly.ads, libgnarl/s-osinte__gnu.adb,
	libgnarl/s-osinte__gnu.ads, libgnarl/s-osinte__hpux-dce.adb,
	libgnarl/s-osinte__hpux-dce.ads,
	libgnarl/s-taprop__hpux-dce.adb,
	libgnarl/s-taspri__hpux-dce.ads: Bump copyright notices to 2018.

From-SVN: r263698