System-dependent integer overflow fixes.
* process.c (Fset_process_window_size): Signal an error if the window size is outside the range supported by the lower level. * sysdep.c (set_window_size): Return negative on error, nonnegative on success, rather than -1, 0, 1 on not in system, failure, success. This is simpler. Caller changed. (serial_configure): Remove unnecessary initialization of local. (procfs_get_total_memory) [GNU_LINUX]: Don't assume system memory size fits in unsigned long; this isn't true on some 32-bit hosts. Avoid buffer overrun if some future version of /proc/meminfo has a variable name longer than 20 bytes. (system_process_attributes) [__FreeBSD__]: Don't assume hw.availpages fits in 'int'.
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