evm: allow setting pre-defined accounts in genesis (#6086)

* evm: allow setting pre-defined accounts in genesis

* Only build GenesisAccount in std

substrate/bin/node/runtime/src/lib.rs

@@ -93,7 +93,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to 0. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 249,
+	spec_version: 250,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 1,