cpu: reduce syscalls and avoid runtime fmt parsing#2087
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Currently, ReadcpuTempFile() uses lseek() + read() internally and parses the temperature string with fscanf(). Now, pread(), directly reading from offset 0, avoids the double syscall from lseek() + read() and the internal locking in the stdio functions, and strtol() avoids the runtime format parsing and the variadic argument overhead from fscanf().