Support GCC 15 (rust-rocksdb#1007)

Author: tustvold

librocksdb-sys/build.rs

@@ -280,6 +280,7 @@ fn build_rocksdb() {
     } else if !target.contains("windows") {
         config.cpp_link_stdlib("c++");
     }
+    config.flag("-include").flag("cstdint");
     config.compile("librocksdb.a");
 }