Ignore unsupported ulimit -x errors

On Mac OS X (aka Darwin) and some versions of Linux, /bin/sh does
not support ulimit -x.  Ignore any errors trying to adjust that
particular resource usage limit.

Change-Id: Ib419c53e23ec904e1215b0541ba0f5bb9e029791
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed