[patch] build with versioned compiler

[Matthias Klose]

Two updates:

 - allow openjdk/corba build with a versioned compiler (e.g. gcc-4.3)

 - fix build failure when gcc version != gcj version, and the libgcj.so
   installed in gcc_lib_dir cannot be found (debian and ubuntu do install
   an extra symlink in /usr/lib/jvm/java-gcj/lib for that reason).

Matthias
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