/usr/src/gcc-5/debian/libgcjGCJ-awt.overrides is in gcc-5-source 5.3.1-14ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # pick up the exact version, in case another gcj version is installed
libgcj@GCJ@-awt binary: binary-or-shlib-defines-rpath
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