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c1ea7bd0b6
Define NetBSD and Darwin/macOS feature test macros. Autoconf defines these too (and a few others). Define the macros on Windows except with MSVC. The _GNU_SOURCE macro makes a difference with mingw-w64. Use a function instead of a macro. Don't take the TARGET_OR_ALL argument because there's always global effect because the global variable CMAKE_REQUIRED_DEFINITIONS is modified.