dllmain: exclude from Cygwin builds#17528
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On Cygwin, it is unsafe to call POSIX functions from DllMain, which OPENSSL_thread_stop does. Additionally, it should be unnecessary as OpenSSL uses pthread_key_create to register a thread destructor to do thread cleanup in a POSIX way. Reported-by: Yuyi Wang <Strawberry_Str@hotmail.com> Ref: https://cygwin.com/pipermail/cygwin/2025-June/258235.html Fixes curl#17262
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On Cygwin, it is unsafe to call POSIX functions from DllMain, which OPENSSL_thread_stop does. Additionally, it should be unnecessary as OpenSSL uses pthread_key_create to register a thread destructor to do thread cleanup in a POSIX way.
Reported-by: Yuyi Wang <@Berrysoft>
Ref: https://cygwin.com/pipermail/cygwin/2025-June/258235.html
Fixes #17262