Jon Turney authored Mar 07, 2015 and Hugo Beauzée-Luyssen committed Dec 20, 2017

* It seems we must use gyp --no-parallel, as parallel operation fails in the
appveyor environment for unknown reasons.

* The Makefile written by gyp doesn't have an install target, so install the
gyp build products (libbreakpad_client.a, breakpad-client.pc and
crash_generation_app.exe).

v2:
Make appveyor.sh work when builddir != srcdir

v3:
Include 'make check' in appveyor.sh

* Apply a patch needed to build gtest r615 for Windows with -Werror=unused-variable
* Ensure PATH is set so tests can find needed runtime DLLs
* Relax a test which requires POSIX regex when built without them
* Don't test ifstream.good() even though we haven't yet read at the EOF (this
looks like a MinGW bug...)

v4:
Remove os:unstable from appveyor.yml
Apparently this might make the build use VMs on older, slower infrastructure
Update for changed script name

v5:
Maybe appveyor is fast enough for make check now

v6:
Remove gtest patch as no longer needed
Add to, rather than replace, msvs-only appveyor.yml
Run unittests on gcc (still failures, though)
Add cygwin to build matrix