[BACKPORT] collision between __LEAF define in interfaceSupport.hpp and /usr/include/sys/cdefs.h with gcc

[Andrew Hughes]

Another backport needed to get OpenJDK6 building on modern systems.

There's a collision with the _LEAF symbol in recent versions of glibc.

Changeset: http://hg.openjdk.java.net/jdk7u/jdk7u/hotspot/rev/a6eef545f1a2

Original thread: http://mail.openjdk.java.net/pipermail/hotspot-dev/2011-October/004589.html

Applies cleanly to OpenJDK6.

Ok for backport?
-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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