This commit adds the printing of the ggml version and commit to the
test-cmake example.
The motivation is just to be able to quickly verify that the correct
version of ggml is being used.
Example output:
```console
test-cmake] llama.cpp version: 0.4.0-dev, build: 10837 (5202104b5)
[test-cmake] ggml version: 0.23.0, commit: 5202104b5
[test-cmake] Initializing backend...
...
```
Daniel Bevenius
1173700b9c