[patch] link java tools with -rpath $(dbexecdir)

[Matthias Klose]

When installing two different gcj versions under the same prefix, the
libgcj_bc.so.1 symlink is overwritten. Assume that you install 4.3.0 first, then
reinstall an older version (having the libgcj_bc.so.1 symlink), java programs
cannot be run anymore, because you get an ABI mismatch. This affects all java
tools, including ecj1. It would be nice to make an installation more robust:

 - Install a copy of libgcj_bc.so.1 into $(dbexecdir)
 - Link the java tools with -rpath $(dbexecdir)

The attached patch does this for ecj1 and gcj-dbtool; gij already is linked in
this way. Other tools could be extended in the same way.

  Matthias

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