Delete unused file

tests/testsuite/TrafficLight_Basic/dataview_ada.gpr

-project DataView_Ada is
-   for Languages use ("ASN1");
-   for Source_Dirs use (".");
-   for Source_Files use ("dataview-uniq.asn");
-   for Object_Dir use "code";
-
-   package Naming is
-       for Body_Suffix ("ASN1") use ".asn";
-   end Naming;
-
-   package Compiler is
-       for Driver ("ASN1") use "asn1.exe";
-
-       for Leading_Required_Switches ("ASN1") use ("-Ada", "-typePrefix", "Asn1Scc");
-   end Compiler;
-end DataView_Ada;
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