set --enable-uname-release=2.6.32

  * Pass --enable-uname-release=2.6.32 for the user emulation builds, so that
    we have a sensible baseline kernel value regardless of what the
    underlying host kernel is.  This makes eglibc happier when running under
    emulation on a very old kernel for instance (whose host syscall ABI has
    nothing to do with what emulated syscalls are supported), and probably
    also lets us steer clear for the moment of code that has problem with
    the new kernel upstream versioning convention.  LP: #921078.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>