hg: portola/portola/hotspot: Only use dlvsym for libnuma lookups if it's available

[mikael.vidstedt at oracle.com]

Changeset: dd3e7aeb56ed
Author:    mikael
Date:      2017-04-11 19:06 -0700
URL:       http://hg.openjdk.java.net/portola/portola/hotspot/rev/dd3e7aeb56ed

Only use dlvsym for libnuma lookups if it's available

! src/os/linux/vm/os_linux.cpp