/usr/src/gcc-4.6/debian/source.lintian-overrides.in is in gcc-4.6-source 4.6.4-6ubuntu2.
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 | @SRC@: invalid-arch-string-in-source-relation
@SRC@: quilt-build-dep-but-no-series-file
@SRC@: weak-library-dev-dependency libgnatvsn@BV@-dev on libgnatvsn@BV@ (= ${gnat:Version})
@SRC@: weak-library-dev-dependency libgnatprj@BV@-dev on libgnatprj@BV@ (= ${gnat:Version})
@SRC@: weak-library-dev-dependency libgcj@LGCJ@-dev on libgcj@LGCJ@-awt (= ${gcj:Version})
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