Rename testcase files.

Author: godunko

Makefile

@@ -17,4 +17,4 @@ check_extractor:
 	(cd testsuite/extractor && ../../.objs/test_extractor gnat.json exceptions.ads | diff -u --strip-trailing-cr exceptions.out -)
 	(cd testsuite/extractor && ../../.objs/test_extractor gnat.json records.ads | diff -u --strip-trailing-cr records.out -)
 	(cd testsuite/extractor && ../../.objs/test_extractor gnat.json tasks.ads | diff -u --strip-trailing-cr tasks.out -)
-	(cd testsuite/extractor && ../../.objs/test_extractor gnat.json protecteds.ads | diff -u --strip-trailing-cr protecteds.out -)
+	(cd testsuite/extractor && ../../.objs/test_extractor gnat.json protecteds.ads | diff -u --strip-trailing-cr protecteds.ads.out -)