Remove feature gating on "std"

This crate does not have a "std" feature, it does not currently support
`no-std`.

Remove incorrect feature gating.

Author: tcharding

src/json/v17/blockchain/.#mod.rs

@@ -0,0 +1 @@
+[email protected]:1716928611

src/json/v17/blockchain/convert.rs

@@ -107,8 +107,7 @@ impl fmt::Display for GetBlockVerbosityOneError {
     }
 }
 
-#[cfg(feature = "std")]
-impl std::error::Error for model::GetBlockVerbosityOneError {
+impl std::error::Error for GetBlockVerbosityOneError {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         use GetBlockVerbosityOneError::*;
 
@@ -177,8 +176,7 @@ impl fmt::Display for GetTxOutError {
     }
 }
 
-#[cfg(feature = "std")]
-impl std::error::Error for model::GetTxOutError {
+impl std::error::Error for GetTxOutError {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         use GetTxOutError::*;
 

src/json/v17/network/convert.rs

@@ -92,7 +92,6 @@ impl fmt::Display for GetNetworkInfoError {
     }
 }
 
-#[cfg(feature = "std")]
 impl std::error::Error for GetNetworkInfoError {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         use GetNetworkInfoError::*;

src/json/v22/blockchain/convert.rs

@@ -74,7 +74,6 @@ impl fmt::Display for GetBlockchainInfoError {
     }
 }
 
-#[cfg(feature = "std")]
 impl std::error::Error for GetBlockchainInfoError {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         use GetBlockchainInfoError::*;

src/json/v22/network/convert.rs

@@ -92,7 +92,6 @@ impl fmt::Display for GetNetworkInfoError {
     }
 }
 
-#[cfg(feature = "std")]
 impl std::error::Error for GetNetworkInfoError {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         use GetNetworkInfoError::*;