Fix bug #13079 on MS-Windows with temp files not being deleted.
src/w32.h (_child_process): New members input_file and pending_deletion. (register_child): First argument is now pid_t. (record_infile, record_pending_deletion): New prototypes. src/w32proc.c (new_child): Initialize input_file and pending_deletion members of the child. (delete_child): Delete the child's temporary input file, if any, that is pending deletion. (register_child): First argument is now pid_t. (record_infile, record_pending_deletion): New functions. (reap_subprocess): Fix a typo in DebPrint string. (sys_spawnve, sys_kill): Use pid_t for PID arguments. src/fileio.c (internal_delete_file): Return an int again: non-zero if delete-file succeeds, zero otherwise. src/lisp.h (internal_delete_file): Adjust prototype. src/callproc.c (Fcall_process): Don't overwrite infile with result of DECODE_FILE. [WINDOWSNT] If BUFFER is an integer, i.e. we are launching an asynchronous subprocess, record the name of the input file name, if any. (delete_temp_file) [WINDOWSNT]: If internal_delete_file fails to delete the file, record it as pending deletion when the subprocess exits. nt/inc/ms-w32.h (sys_unlink): Provide prototype.
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