Try flto on LLVM 17

Dockerfile

@@ -107,7 +107,7 @@ ARG GEOIP2_VERSION
 ARG NGINX_USER_UID
 ARG NGINX_GROUP_GID
 ARG CONFIG
-ARG CFLAGS_OPT="-O3 -pipe -fomit-frame-pointer -march=sandybridge"
+ARG CFLAGS_OPT="-O3 -pipe -flto -fomit-frame-pointer -march=sandybridge"
 
 ENV VERSION_OPENSSL=openssl-3.4.0 \
 	SHA256_OPENSSL=e15dda82fe2fe8139dc2ac21a36d4ca01d5313c75f99f46c4e8a27709b7294bf \
@@ -116,8 +116,8 @@ ENV VERSION_OPENSSL=openssl-3.4.0 \
     CXXFLAGS="$CFLAGS_OPT" \
     CPPFLAGS="$CFLAGS_OPT" \
     LDFLAGS="-O3 -Wl,--strip-all -Wl,--as-needed" \
-    CC=clang-19 \
-    CXX=clang++-19
+    CC=clang-17 \
+    CXX=clang++-17
 
 # Development environment
 RUN \
@@ -151,7 +151,7 @@ RUN \
 		libreadline-dev && \
 	# download install clang and llvm
 	wget https://apt.llvm.org/llvm.sh && \
-		chmod +x llvm.sh && ./llvm.sh 19
+		chmod +x llvm.sh && ./llvm.sh 17
 
 WORKDIR /usr/src/