Install the mingw OpenSSL package in Appveyor. This makes sure that
the OpenSSL headers and libraries match in Tor's Appveyor builds.

(This bug was triggered by an Appveyor image update.)

Fixes bug 32449; bugfix on 0.3.5.6-rc.

Instead of Windows Server 2016.

Closes ticket 32086.

When Appveyor fails before the install step, some of the finish step's
functions were not defined.

Fixes bug 31884; bugfix on 0.3.4.2-alpha.

Frequently, when a patch fails, it has failures in several files.
Using the "-k" flag will let us learn all the compilation errors,
not just the first one that the compiler hits.

Based on a patch by rl1987.

Closes ticket 31372.

Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit Windows
Server 2012 R2 job. The remaining 2 jobs still provide coverage of
64/32-bit, and Windows Server 2016/2012 R2.

Also set fast_finish, so failed jobs terminate the build immediately.

Fixes bug 29601; bugfix on 0.3.5.4-alpha.

Alexander Færøy authored Nov 27, 2018 and Nick Mathewson committed Dec 17, 2018

This patch ensures that AppVeyor copies over libssp-0.dll and zlib1.dll
to src/test/ to make sure we can run text-process.exe from our slow
tests.

See: https://bugs.torproject.org/28179

Appveyor images are named after the Visual Studio version they contain.
But we compile using MinGW, not Visual Studio.
We use these images because they have different Windows versions.

Closes bug 28826.

This patch explicitly specifies the path to our OpenSSL dependency and
disables the installation of an external OpenSSL version and instead
uses the OpenSSL version available from the MinGW environments.

See: https://bugs.torproject.org/28574

Always show the configure and test logs, and upload them as build
artifacts, when building for Windows using Appveyor CI.

Implements 28459.

Documentation for 28399, 28454, and previous fixes.

The mingw zstd from MSYS2 doesn't come with a pkg-config file.

Fixes 28454 on Tor 0.3.4.1-alpha.

Fixes 28399 on 0.3.4.1-alpha.

Stop installing MSYS2 packages.
We're compiling for mingw, so we only need mingw packages.

Run pacman in verbose mode.

Explicitly install pkg-config and xz, to future-proof our builds.

Diagnostics for 28399.

Build tor on Windows Server 2012 R2 and Windows Server 2016 using
Appveyor's CI.

Closes ticket 28318.

This package conflicts with a preinstalled mingw openssl.

Fixes bug 27943. I think this was an appveyor change, not a Tor bug.

Closes ticket 27765

This commit also changes the appveyor file to a unified line ending
style, since the old one was pretty confused.  Use "-b" to see the
real differences.

As of August 29, 2018, Appveyor images come with gcc 8.2.0 by
default. 64-bit Windows executables compiled with gcc 8.2.0 and
tor's --enable-gcc-hardening crash.

Fixes bug 27460; bugfix on 0.3.4.1-alpha.

Fixes bug 27464; bugfix on 0.3.4.1-alpha.

Also zip the full logs, and upload them as build artifacts.

Implements ticket 27430.

Implements 27449.

Implements 27275.

Original by Marcin Cieślak, with modifications from Isis Lovecruft
and Nick Mathewson.