Fixing web version

cmake/FetchNavigationDependencies.cmake

@@ -52,6 +52,18 @@ function(frg_configure_navigation_dependencies)
 
     set(_clipper_source
         "${FRG_NAVIGATION_THIRDPARTY_DIR}/Clipper2-Clipper2_2.0.1")
+    set(_clipper_core_header
+        "${_clipper_source}/CPP/Clipper2Lib/include/clipper2/clipper.core.h")
+    if(EXISTS "${_clipper_core_header}")
+        file(READ "${_clipper_core_header}" _clipper_core_content)
+        string(FIND "${_clipper_core_content}" "#include <iterator>"
+            _clipper_iterator_include)
+        if(_clipper_iterator_include EQUAL -1)
+            file(WRITE "${_clipper_core_header}"
+                "#include <iterator>\n${_clipper_core_content}")
+        endif()
+    endif()
+
     if(NOT TARGET Clipper2)
         set(CLIPPER2_UTILS OFF CACHE BOOL "" FORCE)
         set(CLIPPER2_EXAMPLES OFF CACHE BOOL "" FORCE)