Error: (vsim-3170) Could not find 'wordmatch_simtop_tc'

When running the vhdeps script in the wikipedia search demo, questasim is unable to locate the testbench.

```
# ** Error: (vsim-3170) Could not find 'wordmatch_simtop_tc'.
# Searched libraries:
# /tmp/tmpkgw0_t6s/unisim
# Error loading design
```

To reproduce:
```
git clone https://github.com/joosthooz/wiki-search-alveo.git
cd wiki-search-alveo/hardware
./run-vhdeps.sh vsim work.WordMatch_SimTop_tc
```

Jeroen and I found a workaround:
```
./run-vhdeps.sh vsim work:WordMatch_SimTop_tc
```

The `run-vhdeps.sh` script is:
```
vhdeps "$@" -i vhdl -i fletcher/hardware -i tta_rtl -i tta_support_rtl -x unisim:$XILINX_VIVADO/data/vhdl/src/unisims/unisim_VCOMP.vhd
```