Define asprintf when _GNU_SOURCE is not set on Linux
#4612
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Not all layers of the c library have asprintf defined, however, it is available when `_GNU_SOURCE` is set.
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@swift-ci please test |
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swift CI rebooted. |
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This PR will define
asprintfwhen_GNU_SOURCEis not set while building for Linux. The build system defines_GNU_SOURCEwhen building for Linux/Android here; https://github.com/apple/swift-corelibs-foundation/blob/main/CoreFoundation/CMakeLists.txt#L69-L70, but being pedantically correct will ensure there are no surprises.