Fix of Webview2 deps.

Added checking existence of target (Mac + Linux).
Force webview2 to be appended to build list (Win).

deps/CMakeLists.txt

@@ -140,11 +140,6 @@ if (UNIX)
     endif ()
 endif ()
 
-if (MSVC)
-    list(APPEND REQUIRED_PACKAGES WebView2)
-endif()
-
-
 list(APPEND SYSTEM_PROVIDED_PACKAGES ${${PROJECT_NAME}_PLATFORM_PACKAGES})
 list(REMOVE_DUPLICATES SYSTEM_PROVIDED_PACKAGES)
 
@@ -185,7 +180,7 @@ foreach (pkg ${FOUND_PACKAGES})
 
         if (${pkg} IN_LIST SYSTEM_PROVIDED_PACKAGES)
           check_system_package(${pkg} _checked_list)
-        else ()
+        elseif (TARGET dep_${pkg})
           get_target_property(_is_excluded_from_all dep_${pkg} EXCLUDE_FROM_ALL)
           if (NOT _is_excluded_from_all)
             list(APPEND DEPS_TO_BUILD ${pkg})
@@ -194,6 +189,12 @@ foreach (pkg ${FOUND_PACKAGES})
     endif ()
 endforeach()
 
+# This ugly append ensures that WebView2 was appended no matter what EXCLUDE_FROM_ALL is.
+# (Webview2 is not added by add_cmake_project)
+if (MSVC)
+  list(APPEND DEPS_TO_BUILD WebView2)
+endif()
+
 # Establish dependency graph
 foreach (pkg ${SUPPORTED_PACKAGES})
   if (${pkg} IN_LIST DEPS_TO_BUILD)