OpenSystemsDevelopment / qpdf

This is all that ever worked. The test suite was trying to do
something different from ClosedFileInputSource.

It is redundant with qpdf's main CI environment, which is Azure
Pipelines, but may soon be migrated to GitHub Actions.

Make clear that you almost always want + or - before an angle when
specifying rotation.

StreamDataProvider::provideStreamData now has a rich enough API for it
to effectively proxy to pipeStreamData.

For wildcard expansion to work properly with the msvc binary, it is
necessary to link with setargv.obj or wsetargv.obj, depending on
whether wmain is in use.

Includes updates to m4/ax_cxx_compile_stdcxx.m4 to make it work with
msvc, which supports C++-11 with no flags but doesn't set __cplusplus
to a recent value.

Removed ones that were fixed upstream, and added a new one, all from
the jpeg library.