fix: do not use ringbuf feature, to make app store reviewers happy

deltachat-ios.xcodeproj/project.pbxproj

@@ -605,7 +605,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "# The $PATH used by XCode likely won't contain Cargo, fix that.\n# This assumes a default `rustup` setup.\nexport PATH=\"$HOME/.cargo/bin:$PATH\"\n\n# ensure all targets are installed\nrustup target add aarch64-apple-ios x86_64-apple-ios --toolchain `cat deltachat-ios/libraries/deltachat-core-rust/rust-toolchain`\n\n# --xcode-integ determines --release and --targets from XCode's env vars.\n# Depending your setup, specify the rustup toolchain explicitly.\ncargo +`cat deltachat-ios/libraries/deltachat-core-rust/rust-toolchain` lipo --release --manifest-path deltachat-ios/libraries/deltachat-core-rust/deltachat-ffi/Cargo.toml\n";
+			shellScript = "# The $PATH used by XCode likely won't contain Cargo, fix that.\n# This assumes a default `rustup` setup.\nexport PATH=\"$HOME/.cargo/bin:$PATH\"\n\n# ensure all targets are installed\nrustup target add aarch64-apple-ios x86_64-apple-ios --toolchain `cat deltachat-ios/libraries/deltachat-core-rust/rust-toolchain`\n\n# --xcode-integ determines --release and --targets from XCode's env vars.\n# Depending your setup, specify the rustup toolchain explicitly.\ncargo +`cat deltachat-ios/libraries/deltachat-core-rust/rust-toolchain` lipo --release --manifest-path deltachat-ios/libraries/deltachat-core-rust/deltachat-ffi/Cargo.toml --no-default-features --features nightly\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 

deltachat-ios/libraries/deltachat-core-rust

@@ -1 +1 @@
-Subproject commit c7c86f1b038077365e6d634772eea63a9759228e
+Subproject commit 692b779896fe479ba4d53b09d36998fec85fd0bd