ggml: check if non-native endian model is being loaded (llama/13943)

ggml: check if non-native endian model is being loaded (llama/13943)

* gguf: prevent non-native endian models from being loaded

Signed-off-by: Aaron Teo <redacted>
* gguf: update error message

Signed-off-by: Aaron Teo <redacted>
* gguf: make the non-native endian check more verbose

Signed-off-by: Aaron Teo <redacted>
* ggml: move ggml_assert location

Signed-off-by: Aaron Teo <redacted>
* ggml: reword the endianness check error message

Signed-off-by: Aaron Teo <redacted>
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Signed-off-by: Aaron Teo <redacted>