All previous relevant platform-specific tests have been changed to use this
symbol. Also, samples/image now premultiplies conditionally, correcting a
visual anomaly on wxGTK.
This is a combination of running clang-tidy with modernize-use-nullptr
check for some ports (GTK, X11, OSX) and manual changes to the ports for
which it couldn't be used easily (MSW, DFB) and also manually updating
the docs.
Also replace NULL with null or nullptr in the comments as this is more
consistent with the use of nullptr in the code and makes it simpler to
grep for the remaining occurrences of NULL itself.
And also use null in the assert messages.
Only a few occurrences of "NULL" are still left in non-C files, mostly
corresponding to unclear comments or string output which it might not be
safe to change.
Now that these Direct2D tests are compiled, disable those of them that
fail under Wine due to missing support for Direct2D functionality we use
in Wine implementation.
Don't even give a warning message because there would be too many of
them in these tests, just skip them silently.
