Add header to OTBCheckSSEFeatures; Future work: use cmake_host_system_information

CMake/OTBCheckSSEFeatures.cmake

+#
+# Copyright (C) 2005-2019 Centre National d'Etudes Spatiales (CNES)
+#
+# This file is part of Orfeo Toolbox
+#
+#     https://www.orfeo-toolbox.org/
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This should be deleted as it can be done with cmake_host_system_information
+# https://cmake.org/cmake/help/v3.10/command/cmake_host_system_information.html?highlight=sse
 function(check_sse_features sse_flags )
   include(CheckCXXSourceRuns)
   include(CheckCXXCompilerFlag)

CMake/OTBCheckTargetSystemArch.cmake

@@ -18,6 +18,9 @@
 # limitations under the License.
 #
 
+# This maybe deleted as it might be done with cmake_host_system_information
+# https://cmake.org/cmake/help/v3.10/command/cmake_host_system_information.html?highlight=sse
+
 macro(OTB_CHECK_TARGET_SYSTEM_ARCH _RESULT1 _RESULT2)
   set(${_RESULT1} "x64")
   set(${_RESULT2} TRUE)