chore: ignore some warnings on release build on arch PKGBUILD

packaging/archlinux/PKGBUILD

@@ -34,7 +34,9 @@ build() {
     cmake -B build -S "$pkgname" \
         -DCMAKE_BUILD_TYPE='Release' \
         -DCMAKE_INSTALL_PREFIX="/opt/${_pkgname}" \
-        -Wno-dev
+        -Wno-dev \
+        -DCMAKE_CXX_FLAGS="-ffat-lto-objects -Wno-builtin-macro-redefined" \
+        -DCMAKE_C_FLAGS="-Wno-builtin-macro-redefined"
     cmake --build build
 }