cmake: disable ICC warnings from protobuf code

modules/dnn/3rdparty/protobuf/CMakeLists.txt

@@ -22,6 +22,11 @@ else()
                                        -Wunused-function -Wunused-const-variable
   )
 endif()
+if(CV_ICC)
+  ocv_warnings_disable(CMAKE_CXX_FLAGS
+      -wd265 -wd858 -wd873 -wd2196
+  )
+endif()
 
 # Easier to support different versions of protobufs
 function(append_if_exist OUTPUT_LIST)

modules/dnn/cmake/OpenCVFindLibProtobuf.cmake

@@ -47,8 +47,10 @@ endif()
 add_definitions(-DHAVE_PROTOBUF=1)
 
 #supress warnings in autogenerated caffe.pb.* files
-ocv_warnings_disable(CMAKE_CXX_FLAGS -Wunused-parameter -Wundef -Wignored-qualifiers -Wno-enum-compare
-                                     -Wdeprecated-declarations)
-ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4125 /wd4267 /wd4127 /wd4244 /wd4512 /wd4702
-                                     /wd4456 /wd4510 /wd4610 /wd4800
+ocv_warnings_disable(CMAKE_CXX_FLAGS
+    -Wunused-parameter -Wundef -Wignored-qualifiers -Wno-enum-compare
+    -Wdeprecated-declarations
+    /wd4125 /wd4267 /wd4127 /wd4244 /wd4512 /wd4702
+    /wd4456 /wd4510 /wd4610 /wd4800
+    -wd858 -wd2196
 )