Julia crash: libpangoft2-1.0.so.0 issue.

A similar issue was reported [here](https://github.com/JuliaGraphics/Immerse.jl/issues/60). In my case, to produce the crash this is sufficient:

``` Julia
Using PyPlot
plot(rand(10))
```

```
julia: symbol lookup error: /usr/bin/../lib/libpangoft2-1.0.so.0: undefined symbol: FcWeightFromOpenType
```

I am on Arch Linux. Running Julia 0.4.5. Here some additional info:

``` Julia
PyPlot.backend
"qt4agg"
```

``` Bash
ls -la /usr/lib/libpangoft2-1.0.so.0
lrwxrwxrwx 1 root root 27 Apr 12 22:38 /usr/lib/libpangoft2-1.0.so.0 -> libpangoft2-1.0.so.0.4000.1
```

Hope you find this useful.

Start by reproducing the crash with Julia 0.4.5, PyPlot, the qt4agg backend, and plot(rand(10)); compare the report with the linked Immerse.jl issue. Inspect the reported libpangoft2-1.0.so.0 symbol-lookup failure on Arch Linux, and consider the issue complete when the cause and an appropriate resolution or documentation are established.

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