Set type for dynamically configured toolchains // Resolves platformio#765

In some cases toolchain packages may be missing in platform manifest

Author: valeros

platform.py

@@ -396,6 +396,7 @@ def configure_arduino_toolchains(self, package_index):
                 self.packages[toolchain_package] = dict()
             self.packages[toolchain_package]["version"] = version
             self.packages[toolchain_package]["owner"] = "espressif"
+            self.packages[toolchain_package]["type"] = "toolchain"
 
     def configure_upstream_arduino_packages(self, url_items):
         framework_index_file = os.path.join(