https://gitlab.synchro.net/main/sbbs/-/commit/2710c20e54f8a1affdcfb024
Modified Files:
src/sftp/sftp_client.c
Log Message:
sftp: drop pthread_key TLS for last-error, store on state struct

pthread_key_create / pthread_setspecific / pthread_getspecific are not
shimmed by xpdev/threadwrap.h (only pthread_mutex_* is), so sftp_client.c
did not build on Win32 or any other non-pthreads target. Replace the TLS
slot with a plain uint32_t last_error field on struct sftp_client_state; state->mtx already serializes every op, so no new lock is needed. Public
API (sftpc_get_err and the bool returns from sftpc_open/read/write/etc.)
is unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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