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c4b85ba704Bugfix: Define and use HAVE_FDATASYNC correctly outside LevelDB (Luke Dashjr) Pull request description: Fixes a bug introduced in #19614 The LevelDB-specific fdatasync check was only using `AC_SUBST`, which works for Makefiles, but doesn't define anything for C++. Furthermore, the #define is typically 0 or 1, never undefined. This fixes both issues by defining it and checking its value instead of whether it is merely defined. Pulled out of #14501 by fanquake's request ACKs for top commit: fanquake: ACKc4b85ba704- thanks for catching and fixing my mistake. laanwj: Code review ACKc4b85ba704Tree-SHA512: 91d5d426ba000b4f3ee7e2315635e24bbb23ceff16269ddf4f65a63d25fc9e9cf94a3b236eed2f8031cc36ddcf78aeb5916efcb244f415943a8a12f907ede8f9