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/test/Cargo.toml

@@ -36,21 +36,22 @@ test-pallet = { package = "frame-support-test-pallet", default-features = false,
 [features]
 default = ["std"]
 std = [
-	"serde/std",
 	"codec/std",
-	"scale-info/std",
 	"frame-benchmarking/std",
 	"frame-executive/std",
 	"frame-support/std",
 	"frame-system/std",
+	"scale-info/std",
+	"serde/std",
+	"sp-api/std",
+	"sp-arithmetic/std",
 	"sp-core/std",
-	"sp-std/std",
 	"sp-io/std",
 	"sp-runtime/std",
 	"sp-state-machine",
-	"sp-arithmetic/std",
+	"sp-std/std",
 	"sp-version/std",
-	"sp-api/std",
+	"test-pallet/std",
 ]
 try-runtime = [
 	"frame-support/try-runtime",