frame: GenesisBuild::build allowed in no_std (#14107)

* frame: GenesisBuild::build allowed in no_std

i`GenesisBuild::build` function will be required for no_std in no native
runtime world.

`GenesisBuild::build` macro generated function allows to build the runtime
GenesisConfig assembled from all pallets' GenesisConfigs.

* fixes

* GenesisBuild::build avaiable in no-std

- #[cfg(feature = "std")] is not longer added to GenesisBuild implementation.

* system: hash69 available for no-std

* elections-phragmen: panic message fixed for no_std

* frame::suport: doc updated

* test-runtime: default for GenesisConfig

* frame::test-pallet: serde/std added to std feature deps

* Cargo.toml: deps sorted

* Cargo.lock update

cargo update -p frame-support-test-pallet -p frame-support-test

* frame ui tests: cleanup

---------

Co-authored-by: parity-processbot <>

substrate/frame/support/src/traits.rs

@@ -80,11 +80,9 @@ pub use metadata::{
 };
 
 mod hooks;
-#[cfg(feature = "std")]
-pub use hooks::GenesisBuild;
 pub use hooks::{
-	Hooks, IntegrityTest, OnFinalize, OnGenesis, OnIdle, OnInitialize, OnRuntimeUpgrade,
-	OnTimestampSet,
+	GenesisBuild, Hooks, IntegrityTest, OnFinalize, OnGenesis, OnIdle, OnInitialize,
+	OnRuntimeUpgrade, OnTimestampSet,
 };
 
 pub mod schedule;