/usr/src/gcc-4.9/debian/gcj-BV-jre-headless.overrides is in gcc-4.9-source 4.9.3-13ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # pick up the exact version, in case another gcj version is installed
gcj-@BV@-jre-headless binary: binary-or-shlib-defines-rpath
# don't strip the binaries, keep the libgcj13-dbg package Multi-Arch: same
gcj-@BV@-jre-headless binary: unstripped-binary-or-object
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