[LV2] [PATCH] Suil Qt4 in Gtk2 Fixin's

[Michael Fisher]

Hello,

Here's a patch that addresses a few issues with suil's qt4 in gtk2
wrapping

1) QApplication is and can only ever be a single instance. Previously a
new QApplication was being created for each individual wrapped Qt4UI.
2) QApplication requires that argc is > 0 and argv isn't NULL
3) QGtkStyle causes horrible crashes (don't know why).  This patch
forces the usage of the "plastique" Qt theme.

# 3 is kind of just a workaround, but it keeps Ingen/Ardour3 from
crashing all the time while testing some Qt4UI's.

Dave, I made this with git.  Hopefully that isn't a problem.  The patch
should apply cleanly to your SVN r5144.

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