I already tried that. I even cleaned everything and did a fresh git clone. I have the same problem with branch 7.95.beta6 
Looking at the error, there is something strange :
APPLY PATCH (project) /home/nabil/LIBREELEC/AFL/8.0.1b/http://LibreELEC.tv/projects/S905/patches/media_build/media_build-fix.patch
can't find file to patch at input line 5
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff --git a/media_build/v4l/compat.h b/media_build/v4l/compat.h
|index aee654a..03e1882 100644
|--- a/media_build/v4l/compat.h
|+++ b/media_build/v4l/compat.h
--------------------------
File to patch:
The path in the patch file shouldn't be /media_build/v4l/compat.h. It should be /v4l/compat.h.
So I solved it by manually editing these 2 patch files :
projects/S905/patches/media_build/media_build-fix.patch
projects/S905/patches/media_build/media_build-frame_vector_workaround.patch