Enable LTO by default

.github/workflows/osrm-backend.yml

@@ -267,6 +267,7 @@ jobs:
             CCOMPILER: clang-15
             CXXCOMPILER: clang++-15
             ENABLE_CONAN: ON
+            ENABLE_LTO: OFF
 
           - name: gcc-14-release
             continue-on-error: false
@@ -367,7 +368,6 @@ jobs:
       OSRM_CONNECTION_EXP_BACKOFF_COEF: ${{ matrix.OSRM_CONNECTION_EXP_BACKOFF_COEF }}
       ENABLE_LTO: ${{ matrix.ENABLE_LTO }}
     steps:
-    - run: echo "LTO=${ENABLE_LTO:-ON}"
     - uses: actions/checkout@v4
     - name: Build machine architecture
       run: uname -m
@@ -527,8 +527,8 @@ jobs:
                  -DENABLE_SANITIZER=${ENABLE_SANITIZER:-OFF} \
                  -DBUILD_TOOLS=${BUILD_TOOLS:-OFF} \
                  -DENABLE_CCACHE=ON \
-                 -DCMAKE_INSTALL_PREFIX=${OSRM_INSTALL_DIR} \
-                 -DENABLE_LTO=${ENABLE_LTO:-ON}
+                 -DENABLE_LTO=${ENABLE_LTO:-ON} \
+                 -DCMAKE_INSTALL_PREFIX=${OSRM_INSTALL_DIR}
         make --jobs=${JOBS}
 
         if [[ "${NODE_PACKAGE_TESTS_ONLY}" != "ON" ]]; then