Fix http downloads for Windows

[jgm]

From the http-conduit documentation:

Any network code on Windows requires some initialization, and the network library provides withSocketsDo to perform it. Therefore, proper usage of this library will always involve calling that function at some point. The best approach is to simply call them at the beginning of your main function, such as:

 import Network.HTTP.Conduit
 import qualified Data.ByteString.Lazy as L
 import Network (withSocketsDo)

 main = withSocketsDo
      $ simpleHttp "http://www.haskell.org/" >>= L.putStr

This is probably what is causing reports of Result: "InternalIOException getAddrInfo: does not exist (error 10093)" in pandoc 1.12.2. (See report on pandoc-discuss.)

[jgm]

While we're at it, let's make sure it works with the new http-conduit 2.0.

[dchaumette]

I've tested the patch on my Windows machine, as per below.
I don't get getAddrInfo error messages any more, and the output files are as they should be, so as far as I'm concerned the fix did the trick.

C:\Temp>pandoc -s -r html http://www.gnu.org/software/make/ -o example12.text

C:\Temp>pandoc -s -r markdown_github https://raw.github.com/ys/chekku/master/README.md -o example123.text
tls-extra:Network.TLS.Extra.Certificate
****************** certificate verify chain doesn't yet work on your platform **********************
please consider contributing to the certificate package to fix this issue

[jgm]

Excellent.

+++ Damien Chaumette [Dec 10 13 04:25 ]:

I've tested the patch on my Windows machine, as per below.
I don't get getAddrInfo error messages any more, and the output files
are as they should be, so as far as I'm concerned the fix did the
trick.
C:\Temp>pandoc -s -r html http://www.gnu.org/software/make/ -o example12.text

C:\Temp>pandoc -s -r markdown_github https://raw.github.com/ys/chekku/master/REA
DME.md -o example123.text
tls-extra:Network.TLS.Extra.Certificate
****************** certificate verify chain doesn't yet work on your platform **

---

please consider contributing to the certificate package to fix this issue

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References

1. Fix http downloads for Windows #1080 (comment)