Certificates: address soundness script errors (#6255)

With these changes `./Utilities/soundness.sh` can successfully pass.

Author: MaxDesiatov

Utilities/Certificates/empty.swift

@@ -0,0 +1,11 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift open source project
+//
+// Copyright (c) YEARS Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//

Utilities/Certificates/generate.sh

@@ -1,4 +1,15 @@
-#!/bin/sh
+#!/bin/bash
+##===----------------------------------------------------------------------===##
+##
+## This source file is part of the Swift open source project
+##
+## Copyright (c) YEARS Apple Inc. and the Swift project authors
+## Licensed under Apache License v2.0 with Runtime Library Exception
+##
+## See http://swift.org/LICENSE.txt for license information
+## See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+##
+##===----------------------------------------------------------------------===##
 
 swift build
 cp .build/arm64-apple-macosx/debug/Certificates.build/DerivedSources/embedded_resources.swift ../../Sources/PackageSigning/

Utilities/soundness.sh

@@ -64,7 +64,15 @@ for language in swift-or-c bash python; do
   matching_files=( -name '*' )
   case "$language" in
       swift-or-c)
-        exceptions=( -name "Package.swift" -o -path "./Examples/*" -o -path "./Fixtures/*" -o -path "./IntegrationTests/*" -o -path "./Tests/ExtraTests/*" -o -path "./Tests/PackageLoadingTests/Inputs/*"  )
+        exceptions=( 
+          -name "Package.swift" 
+          -o -path "./Sources/PackageSigning/embedded_resources.swift"
+          -o -path "./Examples/*" 
+          -o -path "./Fixtures/*" 
+          -o -path "./IntegrationTests/*" 
+          -o -path "./Tests/ExtraTests/*" 
+          -o -path "./Tests/PackageLoadingTests/Inputs/*"  
+        )
         matching_files=( -name '*.swift' -o -name '*.c' -o -name '*.h' )
         cat > "$tmp" <<"EOF"
 //===----------------------------------------------------------------------===//