make mips (and others?) pass java extension smoketest with gcj's libjvm

i.e. force the __data_start symbol to exist in any executables that link
against libuno_sal so that dlopening of the libgcj provided libjvm.so on some
platforms where it needs that symbol will succeed. e.g. Debian mips/lenny with
gcc 4.3.

With this in place the smoketest succeeds with libgcj provided java. Quite
possibly also required/helpful for s390x/s390 and maybe some others.

Without it the dlopen of libjvm.so will fail with __data_start not found

Change-Id: I01a4de3d7e72d000a8d56a1b9101a187c26a1751

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