[Ada] Export the Ada version through the C interface

[Pierre-Marie de Rodat]

This just exports the version of the language internally used in the
front-end of the compiler through the C interface.

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

2019-12-16  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* fe.h (Ada_Version_Type): New typedef.
	(Ada_Version): Declare.
	* opt.ads (Ada_Version_Type): Add Convention C and WARNING line.
	(Ada_Version): Add WARNING line.
	(Exception_Mechanism_Type): Likewise.
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