libprocps: protect locale environment getting overwrite

libprocps: protect locale environment getting overwrite

The problem is that in ./proc/sysinfo.c uptime(), it is not
considered that the "savelocale" string is overwritten by the
subsequent call to setlocale().  Hence restoring the locale later on
won't work this way.  "savelocale" ought to be a copy of the string
pointed to by setlocale()'s return-value.

Bug-Redhat: https://bugzilla.redhat.com/show_bug.cgi?id=548711
Backported-by: Sami Kerola <kerolasa@iki.fi>