ada: Better error message if non-Ada2022 code declares No_Return function

ada: Better error message if non-Ada2022 code declares No_Return function

When a feature that is legal in Ada2022 but not in earlier Ada versions
is used, we typically want to call Error_Msg_Ada_2022_Feature in order to
generate an informative message in the error case. Specifying No_Return
for a function (as opposed to a procedure) is no exception to this rule.

gcc/ada/

	* sem_prag.adb (Analyze_Pragma): In Check_No_Return, call
	Error_Msg_Ada_2022_Feature in the case of a function. Remove code
	outside of Check_No_Return that was querying Ada_Version.