Backfill missing TOML features (#11351)

* only check std

* add default-features=false

* Revert "add default-features=false"

This reverts commit bc9453757a1df670f418a2d57ee4ce203425ab1b.

* missing features only to non-optional

substrate/primitives/core/hashing/Cargo.toml

@@ -25,6 +25,7 @@ sp-std = { version = "4.0.0", default-features = false, path = "../../std" }
 default = ["std"]
 std = [
 	"blake2/std",
+	"byteorder/std",
 	"sha2/std",
 	"sha3/std",
 	"sp-std/std",

substrate/primitives/keystore/Cargo.toml

@@ -21,7 +21,7 @@ parking_lot = { version = "0.12.0", default-features = false }
 schnorrkel = { version = "0.9.1", default-features = false, features = ["preaudit_deprecated", "u64_backend"] }
 serde = { version = "1.0", optional = true }
 thiserror = "1.0"
-sp-core = { version = "6.0.0", path = "../core" }
+sp-core = { version = "6.0.0", default-features = false, path = "../core" }
 sp-externalities = { version = "0.12.0", default-features = false, path = "../externalities" }
 
 [dev-dependencies]
@@ -31,6 +31,10 @@ rand_chacha = "0.2.2"
 [features]
 default = ["std"]
 std = [
+	"codec/std",
+	"merlin/std",
 	"schnorrkel/std",
 	"serde",
+	"sp-core/std",
+	"sp-externalities/std",
 ]

substrate/primitives/test-primitives/Cargo.toml

@@ -24,6 +24,10 @@ default = [
 	"std",
 ]
 std = [
+	"codec/std",
+	"parity-util-mem/std",
 	"serde",
 	"sp-application-crypto/std",
+	"sp-core/std",
+	"sp-runtime/std",
 ]