Bug#967672: openjfx: might can do without GTK 2

[John Scott]

Control: forwarded -1 https://bugs.openjdk.java.net/browse/JDK-8198654

I'm not familiar with Java or OpenJFX, but suspect the GTK 2 build and runtime 
dependencies might can be dropped. It looks like using GTK 3 instead of GTK 2 
has been the default for a little while, so GTK 2 shouldn't be getting used 
but the choice is made at runtime.

$ ldd /usr/lib/x86_64-linux-gnu/jni/* | grep gtk
/usr/lib/x86_64-linux-gnu/jni/libglassgtk2.so:
        libgtk-x11-2.0.so.0 => /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0 
(0x00007f262e089000)
/usr/lib/x86_64-linux-gnu/jni/libglassgtk3.so:
        libgtk-3.so.0 => /lib/x86_64-linux-gnu/libgtk-3.so.0 
(0x00007f9bd9d9d000)

Since GTK 3 is getting used anyway there doesn't seem to be any use disabling 
GTK 2 except for its own sake.

https://bugs.openjdk.java.net/browse/JDK-8198654
https://bugs.openjdk.java.net/browse/JDK-8229245
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