fix: switch default running backend to openblas on x86 linux (#380)

ci/prepare_build_environment.sh

@@ -5,5 +5,5 @@ if [[ "$OSTYPE" == "darwin"* ]]; then
 fi
 
 if [[ "$OSTYPE" == "linux"* ]]; then
-  sudo apt-get -y install protobuf-compiler
+  sudo apt-get -y install protobuf-compiler libopenblas-dev
 fi

crates/ctranslate2-bindings/build.rs

@@ -38,7 +38,7 @@ fn link_static() -> PathBuf {
         config
             .define("WITH_MKL", "OFF")
             .define("OPENMP_RUNTIME", "NONE")
-            .define("WITH_RUY", "ON")
+            .define("WITH_OPENBLAS", "ON")
             .cxxflag("-msse4.1")
     } else if cfg!(target_os = "macos") {
         config