* cmake: Define function for querying architecture
The tests and results match exactly those of ggml/src/CMakeLists.txt
* Switch arch detection over to new function
* cmake: Factor out compiler flag function from ggml
llama.cpps's build requires it, too, and we may want to make use of it
without add_subdirectory(ggml).
* cmake: Enable building against system ggml
This facilitates package maintenance for Linux distributions, where the
libggml library most likely will be shipped as an individual package
upon which a llama.cpp package depends.
Piotr Wilkin (ilintar)
xctan
Christian Kastner