[patch] find libgcj.so when version of gcc != version of gcj

[Matthias Klose]

The build system assumes that libgcj.so can be found when using gcc, which is
not the case for different gcc and gcj versions. This adds an additional path to
search for. It allows a user to use GCJ (unset by default), or else replaces gcc
with gcj, and calls gcj --print-file-name=libgcj.so.

ok to checkin?

  Matthias

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