Fixing #2 and wrong paths on xubuntu.

[wolfgang-noichl]

I experienced #2 (like, without any exceptions, but admittedly on a quite slow machine, i5-2410M), and the fix proposed there seems to do the trick. Instead of removing the lines, I made the continue more explicit.

When trying to install the version from this repository, the paths were slightly wrong. The shared library got installed here:

/usr/lib/x86_64-linux-gnu/lib/thunarx-3/thunar-dropbox.so,

whereas it should have been installed here:

/usr/lib/x86_64-linux-gnu/thunarx-3/thunar-dropbox.so

So I did an attempt to fix that, but since I am not familiar with CMAKE, this might mess up things for other platforms than Xubuntu 20.04.

[wolfgang-noichl]

The fix seems to crash Thunar entirely, occasionally. For me, this is better than no Dropbox integration at all (ie without the patch), but no ideal solution yet.