Enable ahead-of-time compilation

[hamiltont]

I was able to see noticeable speedups in sonarr by adding this to my own dockerfile, hope it helps. -O=all is less safe than just --aot, so it may be better to avoid it in some cases. I've noticed it fails on a few of the core libraries (whereas --aot runs with no issues), but it just doesn't worry me that much because mono can fall back to JIT

# Run Ahead-of-time compilation on all DLLs and EXEs
#   See http://www.mono-project.com/docs/advanced/aot/
#   Note: Avoid using -O=all with *.dlls inside /opt/NzbDrone, can cause segfaults
RUN for i in /usr/lib/mono/*/mscorlib.dll; do mono --aot -O=all $i; done && \
 for i in /usr/lib/mono/gac/*/*/*.dll; do mono --aot -O=all $i; done && \
 mono --aot -O=all /opt/NzbDrone/NzbDrone.exe && \
 for i in /opt/NzbDrone/*.dll; do mono --aot $i; done