Removed szip -- since it's statically linked into hdf5 now #82

# to view logs

Job	Run time
cache-hdf5	17s
cache-libtiff	22s
cache-expat	13s
cache-geos	16s
cache-openssl	18s
cache-poco	20s
cache-python-with-debug-symbols	55s
cache-qt	5m 7s
cache-shapelib	21s
cache-yaml	19s
cache-sqlite	15s
cache-zlib	13s
cache-udunits	18s
cache-libpng	15s
cache-netcdf-c	18s
cache-proj	24s
cache-iriclib	57s
cache-gdal	19s
cache-vtk-release	4m 6s
cache-qwt	4m 47s
cache-vtk-debug	5m 39s
create-release	2m 37s
fire-prepost-gui-build-on-appveyor	7s
	28m 43s

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