* lang/qt/src/debug.h: Add export macro.
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This is public API so it should be exported. This did not
resolve a link issue for Windows that I've experienced
when building. But this might be to some uncleanlyness
in my build environment.
* lang/qt/src/Makefile.am: Add new files.
* lang/qt/src/debug.h, lang/qt/src/debug.cpp: New.
* NEWS: Mention it.
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This was previously implemented in Kleopatra, but it makes sense for
all users of qgpgme.