[PATCH] Update TOR build instructions for mingw

Hi,

I've updated the documentation for building TOR on MinGW, and attached the result (and the patch). Please, consider replacing the file <doc/tor-win32-mingw-creation.txt> with it.

Here are the main changes:

the MinGW installer includes the MSYS and DTK packages, so there no need to download and install them separately.
there's no more issue with symlinks for openssl.
specifying "mingw" to the "Configure" command is enough to disable openssl ciphers/hashes that don't compile on MinGW.
since v1.2.5, zlib needs some extra (?) environment variables for its installation.
the libraries download links have been updated so that they point to the latest version to date.
instructions for executing unit-tests have been added for the libraries and TOR.

Maybe zlib should be built before openssl since some optional features of openssl seems to depend on zlib. I followed these instructions in order to build TOR successfully on my WinXP computer.

Trac:
Username: Tey'

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