dockerfile: symlink llvm-config-3.4 to llvm-config so FindLLVM.cmake finds it

scripts/docker/fail-base/Dockerfile

@@ -32,6 +32,9 @@ RUN apt-get install -y     \
     vim                    \
     zlib1g-dev
 
+# Symlink llvm-config-3.4 so FindLLVM.cmake can find it
+RUN ln -s /usr/bin/llvm-config-3.4 /usr/local/bin/llvm-config
+
 # Add a user for compiling FAIL*
 RUN useradd fail; mkdir /home/fail; chown fail /home/fail
 RUN echo 'fail:fail' | chpasswd; chsh fail --shell /bin/bash