Add windows clang to CI (#5537)

- Add windows clang build step
- Closes https://github.com/assimp/assimp/issues/5519


Co-authored-by: Kim Kulling <kim.kulling@draeger.com>
Co-authored-by: Kim Kulling <kullingk@LDED5178.corp.draeger.global>

code/CMakeLists.txt

@@ -1318,11 +1318,6 @@ if(MSVC10)
   endif()
 endif()
 
-IF( MSVC OR "${CMAKE_CXX_SIMULATE_ID}" MATCHES "MSVC") # clang with MSVC ABI
-  ADD_DEFINITIONS( -D_SCL_SECURE_NO_WARNINGS )
-  ADD_DEFINITIONS( -D_CRT_SECURE_NO_WARNINGS )
-endif ()
-
 IF(NOT ASSIMP_HUNTER_ENABLED)
   if (UNZIP_FOUND)
     SET (unzip_compile_SRCS "")
@@ -1415,7 +1410,6 @@ add_compile_options(
 IF (ASSIMP_WARNINGS_AS_ERRORS)
   MESSAGE(STATUS "Treating all warnings as errors (for assimp library only)")
   IF (MSVC)
-
     IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang" ) # clang-cl
       TARGET_COMPILE_OPTIONS(assimp PRIVATE -Wall -Werror
         -Wno-microsoft-enum-value