Fix `gemini_srv` with more conditional comp

src/types/request.rs

@@ -245,6 +245,7 @@ impl Request {
 }
 
 #[allow(clippy::ptr_arg)] // This is a single use function that expects a &String
+#[cfg(feature = "scgi_srv")]
 /// Attempt to decode a 256 bit hash
 ///
 /// Will attempt to decode first as hexadecimal, and then as base64.  If both fail, return
@@ -267,6 +268,7 @@ fn hash_decode(hash: &String) -> Option<[u8; 32]> {
     }
 }
 
+#[cfg(feature = "scgi_srv")]
 /// Attempt to decode a hex encoded nibble to u8
 ///
 /// Returns [`None`] if not a valid hex character