Latest textproc/md4c update seems to break x11/qt6-qtbase build

[Marc Baudoin <babafou%babafou.eu.org@localhost>]

Hi,

It looks like the latest textproc/md4c update seems to break
x11/qt6-qtbase build (NetBSD/amd64 11.0 using bob):

/home/builder/work/x11/qt6-qtbase/work/qtbase-everywhere-src-6.11.2/src/gui/text/qtextmarkdownimporter.cpp:54:57: error: static assertion failed
   54 | static_assert(int(QTextMarkdownImporter::DialectGitHub) ==
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
   55 |               (MD_DIALECT_GITHUB | MD_FLAG_UNDERLINE | QTextMarkdownImporter::FeatureFrontMatter));
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/builder/work/x11/qt6-qtbase/work/qtbase-everywhere-src-6.11.2/src/gui/text/qtextmarkdownimporter.cpp:54:57: note: the comparison reduces to '(1068812 == 1593100)'