[Ada] Small cleanup in the Ada.Text_IO hierarchy

[Pierre-Marie de Rodat]

This removes an implementation subtype declared in the Ada.Text_IO
hierarchy that no longer seems to serve any useful purpose.

No functional changes.

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

gcc/ada/

	* libgnat/a-wtdeio.adb (TFT): Delete and adjust throughout.
	* libgnat/a-wtenau.adb (TFT): Likewise.
	* libgnat/a-wtfiio.adb (TFT): Likewise.
	* libgnat/a-wtflio.adb (TFT): Likewise.
	* libgnat/a-wtinio.adb (TFT): Likewise.
	* libgnat/a-wtinio__128.adb (TFT): Likewise.
	* libgnat/a-wtmoio.adb (TFT): Likewise.
	* libgnat/a-wtmoio__128.adb (TFT): Likewise.
	* libgnat/a-ztdeio.adb (TFT): Likewise.
	* libgnat/a-ztenau.adb (TFT): Likewise.
	* libgnat/a-ztfiio.adb (TFT): Likewise.
	* libgnat/a-ztflio.adb (TFT): Likewise.
	* libgnat/a-ztinio.adb (TFT): Likewise.
	* libgnat/a-ztinio__128.adb (TFT): Likewise.
	* libgnat/a-ztmoio.adb (TFT): Likewise.
	* libgnat/a-ztmoio__128.adb (TFT): Likewise.
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