Merge pull request opencv#19022 from alalek:cmake_avoid_duplication_of_winit_self

Author: alalek

cmake/OpenCVCompilerOptions.cmake

@@ -120,7 +120,6 @@ if(CV_GCC OR CV_CLANG)
   add_extra_compiler_option(-Wshadow)
   add_extra_compiler_option(-Wsign-promo)
   add_extra_compiler_option(-Wuninitialized)
-  add_extra_compiler_option(-Winit-self)
   if(CV_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0) AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0))
     add_extra_compiler_option(-Wno-psabi)
   endif()