patch-2.7.3 no longer applies relative symbolic link patches

[Josh Boyer]

Hi,

I went to do the Fedora 3.19-rc6 build this morning and it failed in
our buildsystem with:

+ '[' '!' -f /builddir/build/SOURCES/patch-3.19-rc6.xz ']'
+ case "$patch" in
+ unxz
+ patch -p1 -F1 -s
symbolic link target '../../../../../include/dt-bindings' is invalid
error: Bad exit status from /var/tmp/rpm-tmp.mWE3ZL (%prep)

That is coming from the hunk in patch-3.19-rc6.xz that creates the
symbolic link from arch/arm64/boot/dts/include/dt-bindings to
include/dt-bindings.  Oddly enough, patch-3.19-rc5.xz contains the
same hunk and it built fine last week.

Digging in, it seems that upstream patch has decided that relative
symlinks are forbidden now as part of a fix for CVE-2015-1196.  You
can find the relevant bugs here:

https://bugzilla.redhat.com/show_bug.cgi?id=1185928
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=775901#13

Aside from locally modifying patch-3.19-rc6.xz, I'm not sure what else
to do.  I thought I would send a heads up since anyone that is using
patch-2.7.3 is probably going to run into this issue.

josh
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