ps: use separate get_uptime() and make it work on non-linux too

Create get_uptime() function in procps/ps.c, and use it rather than
relying on linux-specific sysinfo() inline.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed