[Ubuntu] Hardcoded GDAL version in QGIS package

[Alex Mandel]

I was helping someone on IRC today to install from ubuntugis unstable.
It's not working because gdal for trusty was just updated to 1.11.2

So I looked at the qgis package on my machine and it saying
depends:libgdal.so.1-1.11.1

It struck me as odd that the qgis package specified a specific so
version. Can someone look into this and fix it?

Thanks,
Alex