And some minor changes:
* Remove no-proctitle.c from CSRCS since there is a implementation in nuttx.c
* Add sysinfo-[loadavg|memory].c to CSRCS to provide system info
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
wget is missing from some system (like macOS and Windows native),
it's better to use curl to simplify build environment.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>