[Ada] Mark gnatfind and gnatxref obsolete

[Pierre-Marie de Rodat via Gcc-patches]

Before removing them completely.

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

gcc/ada/

        * gnatfind.adb, gnatxref.adb: Mark these tools as obsolete
        before removing them completely.
diff --git a/gcc/ada/gnatfind.adb b/gcc/ada/gnatfind.adb
--- a/gcc/ada/gnatfind.adb
+++ b/gcc/ada/gnatfind.adb
@@ -347,6 +347,11 @@ procedure Gnatfind is
 --  Start of processing for Gnatfind
 
 begin
+   Put_Line
+     ("WARNING: gnatfind is obsolete and will be removed in the next release");
+   Put_Line
+     ("Consider using Libadalang or GNAT Studio python scripting instead");
+
    Parse_Cmd_Line;
 
    if not Have_Entity then


diff --git a/gcc/ada/gnatxref.adb b/gcc/ada/gnatxref.adb
--- a/gcc/ada/gnatxref.adb
+++ b/gcc/ada/gnatxref.adb
@@ -299,6 +299,11 @@ procedure Gnatxref is
    end Write_Usage;
 
 begin
+   Put_Line
+     ("WARNING: gnatxref is obsolete and will be removed in the next release");
+   Put_Line
+     ("Consider using Libadalang or GNAT Studio python scripting instead");
+
    Parse_Cmd_Line;
 
    if not Have_File then