cmScanDepFormat: support the MSVC 17.3 toolchain temporarily

At least until 17.4 is out.

Source/cmScanDepFormat.cxx

@@ -5,6 +5,7 @@
 
 #include <cctype>
 #include <cstdio>
+#include <iostream>
 #include <utility>
 
 #include <cm/optional>
@@ -280,6 +281,27 @@ bool cmScanDepFormat_P1689_Parse(std::string const& arg_pp,
           info->Requires.push_back(require_info);
         }
       }
+
+      // MSVC 17.3 toolchain bug. Remove when 17.4 is available.
+      if (rule.isMember("is-interface")) {
+        std::cerr
+          << "warning: acknowledging an VS 17.3 toolchain bug; accepting "
+             "until a new release which fixes it is available"
+          << std::endl;
+
+        Json::Value const& is_interface_json = rule["is-interface"];
+        if (!is_interface_json.isBool()) {
+          cmSystemTools::Error(
+            cmStrCat("-E cmake_ninja_dyndep failed to parse ", arg_pp,
+                     ": is-interface is not a boolean"));
+          return false;
+        }
+        bool is_interface = is_interface_json.asBool();
+
+        for (auto& provide : info->Provides) {
+          provide.IsInterface = is_interface;
+        }
+      }
     }
   }