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/usr/src/gcc-4.8/debian/patches/gcc-dfsg-linaro-doc.diff is in gcc-4.8-source 4.8.5-4ubuntu2.

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Index: gcc-4.8-4.8.2/src/gcc/doc/arm-acle-intrinsics.texi
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gcc-4.8-4.8.2/src/gcc/doc/arm-acle-intrinsics.texi	2014-03-18 18:42:11.027303768 +0000
@@ -0,0 +1 @@
+@c This file is empty because the original one has a non DFSG free license (GFDL)