/usr/share/cross-gcc/patches/ is in cross-gcc-dev 14+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/cross-gcc/patches/gcc-4.9/
/usr/share/cross-gcc/patches/gcc-4.9/0001-gcc_cross_multiarch.patch
/usr/share/cross-gcc/patches/gcc-4.9/0002-allow-no-biarch.patch
/usr/share/cross-gcc/patches/gcc-4.9/0003-gxx-crossbase-substvar.patch
/usr/share/cross-gcc/patches/gcc-4.9/0004-reverted-removal-of-with_deps_on_target_arch_pkgs-in.patch
/usr/share/cross-gcc/patches/gcc-4.9/0005-Allow-target-selection-via-dpkg-buildpackage-target-.patch
/usr/share/cross-gcc/patches/gcc-4.9/0006-fix-with_deps_on_target_arch_pkgs-yes-DEB_STAGE-stag.patch
/usr/share/cross-gcc/patches/gcc-4.9/series
/usr/share/cross-gcc/patches/gcc-5/
/usr/share/cross-gcc/patches/gcc-5/0001-gcc_cross_multiarch.patch
/usr/share/cross-gcc/patches/gcc-5/0002-allow-no-biarch.patch
/usr/share/cross-gcc/patches/gcc-5/0003-gxx-crossbase-substvar.patch
/usr/share/cross-gcc/patches/gcc-5/0004-reverted-removal-of-with_deps_on_target_arch_pkgs-in.patch
/usr/share/cross-gcc/patches/gcc-5/0005-Allow-target-selection-via-dpkg-buildpackage-target-.patch
/usr/share/cross-gcc/patches/gcc-5/0006-fix-with_deps_on_target_arch_pkgs-yes-DEB_STAGE-stag.patch
/usr/share/cross-gcc/patches/gcc-5/series