openslide/openslide

Using Unicode characters in the regex produces a regex which fails to
match the output.

glib 10c490cdfe started using Unicode quotes in error strings.  We can't
match these with "." because they're multi-byte sequences and the error
output is in a Python 2 str.

Fixes error:

    Traceback (most recent call last):
      File "driver", line 70, in <module>
        _cygwin = ctypes.CDLL('cygwin1', use_errno=True)
      File "/usr/lib/python2.7/ctypes/__init__.py", line 365, in __init__
        self._handle = _dlopen(self._name, mode)
    OSError: No such file or directory

Don't assume we need them just because windres is available.  Do assume
that windres is available when building for Windows.

https://lists.andrew.cmu.edu/pipermail/openslide-users/2016-July/001274.html

libjpeg-turbo >= 1.5.0 provides a pkg-config file.

The Win32 calling convention only requires 4-byte alignment of stack
frames, but GCC expects 16-byte alignment.  This can cause crashes when
interworking with MSVC, such as openslide/openslide-winbuild#9, if
OpenSlide is not built with compensatory compiler flags (such as
-mstackrealign).  On Win32 only, build the test programs with the stack
frame alignment specified by the Win32 calling convention, in order to
check that interwork is functional.  This can be disabled by configuring
with --disable-checking-windows-abi-compat in case interwork is not
needed.

for consistency, and ease of overriding from the command line.

From gnulib e72ce0ea.

Add OPENSLIDE_TEST_XFAIL and OPENSLIDE_VALGRIND_XFAIL environment
variables, which can contain a comma-separated list of tests which
are expected to fail during run and valgrind respectively.  Complain
if those tests end up passing, but otherwise, just warn about the
expected failure and continue without affecting the exit status.

On glib 2.47.6 through at least 2.48.1, g_convert() adds a BOM to the
beginning of the returned string, causing _wfopen() to fail.  Switch to
g_utf8_to_utf16(), which should also be more efficient.

Fixes #176.

xdelta 3.0.11 enables LZMA secondary compression by default, but distro
binaries don't always support LZMA.  This was breaking the test suite on
Precise, MacPorts, and Cygwin.

Fix an integer overflow in Hamamatsu parsing

Fixes #171.

We can overflow when reading a VMS file. This is bad since we index on the value later and can do an out of bounds memory access.
Thanks to Kostya Kortchinsky.

It actually extracts one JPEG worth of optimisations.

Ignore the map file in the second loop.

None of my sample VMS files have optimisation data for the map file.
On slides with a single Z-layer this would cause us to harmlessly give
up on the .opt file, but slides with multiple Z-layers place the
additional optimisation data after the optimisations for Z-layer 0.
This was causing restart marker position mismatches for those slides.

Stop trying to read optimisations for the map file.

Fixes #165.