Various fixes and empty boilerplate files required for restricted platforms. (#3610)

* Various fixes and empty boilerplate files required for restricted platforms.

Signed-off-by: bosnichd <bosnichd@amazon.com>

* Add comments to address review feedback.

Signed-off-by: bosnichd <bosnichd@amazon.com>

Code/Legacy/CrySystem/CMakeLists.txt

@@ -6,6 +6,8 @@
 #
 #
 
+ly_get_list_relative_pal_filename(pal_dir ${CMAKE_CURRENT_LIST_DIR}/Platform/${PAL_PLATFORM_NAME})
+
 add_subdirectory(XML)
 
 ly_add_target(
@@ -13,9 +15,13 @@ ly_add_target(
     NAMESPACE Legacy
     FILES_CMAKE
         crysystem_files.cmake
+        ${pal_dir}/platform_${PAL_PLATFORM_NAME_LOWERCASE}_files.cmake # Required for restricted platforms
+    PLATFORM_INCLUDE_FILES
+        ${pal_dir}/platform_${PAL_PLATFORM_NAME_LOWERCASE}.cmake # Required for restricted platforms
     INCLUDE_DIRECTORIES
         PUBLIC
             .
+            ${pal_dir} # Required for restricted platforms
     BUILD_DEPENDENCIES
         PRIVATE
             3rdParty::expat

Code/Legacy/CrySystem/Platform/Android/platform_android.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Android/platform_android_files.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Linux/platform_linux.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Linux/platform_linux_files.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Mac/platform_mac.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Mac/platform_mac_files.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Windows/platform_windows.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/Windows/platform_windows_files.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/iOS/platform_ios.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#

Code/Legacy/CrySystem/Platform/iOS/platform_ios_files.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#