[Hardy] SRU: Disable COMPAT_VDSO for custom xen i386 builds

[Stefan Bader]

SRU Justification:

Impact: The COMPAT_VDSO option will cause the VDSO segment (32bit) to appear
also at its old, non-randomized place. It is only required for older libc
versions. 10.04 already is at a newer level and the generic build has it turned off.

Fix: Turn the option off for the custom-binary-xen (i386) build as well.

Testcase: QA regression testing will fail with this option turned on. Verified
it is running successfully in a Hardy VM using the -xen kernel in dom0, as well
as running it as domU on EC2 (m1.small).

-Stefan
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